<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">V</font> be   <a href="classes2.html#NM1">Universe</a>;<br/><b>let </b><font color="Maroon">X</font> be   <a href="zf_refle.html#NM1">Subclass</a> of <font color="Maroon">V</font>;<br/><b>let </b><font color="Maroon">E</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>





<b>assume </b><a NAME="E1:46"/><i><font color="Green">E56</font></i>: 
( <font color="Maroon">X</font> is <a href="zf_fund1.html#V8" target="_self">closed_wrt_A1-A7</a> &amp; <font color="Maroon">E</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font> )
 ;<br/>

<b>let </b><font color="Maroon">H</font> be   <a href="zf_lang.html#NM2">ZF-formula</a>;<br/><b>let </b><font color="Maroon">v1</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="zf_lang.html#K1">VAR</a> ;<br/>



<b>assume </b><a NAME="E2:46"/><i><font color="Green">E57</font></i>: 
 <a href="zf_fund1.html#K7" target="_self">Diagram</a> <font color="Maroon">H</font>,<font color="Maroon">E</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 ;<br/>

<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="46_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:46_1"/>
(  not <font color="Maroon">v1</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font> or <font color="Maroon">v1</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font> )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="46_1_1"><b>suppose </b></a><a NAME="E1:46_1_1"/><i><font color="Green">E61</font></i>: 
not <font color="Maroon">v1</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font>
 ;<br/><div class="add"><a NAME="E2:46_1_1"/><b>then </b>
 <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span>
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T65">ZFMISC_1:65</a></i>;<br/><a NAME="E3:46_1_1"/><b>then </b><i><font color="Green">E62</font></i>: 
 <a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font>
 <b>by </b><i><a class="ref" href="zf_lang1.html#T67">ZF_LANG1:67</a></i>;<br/><a NAME="E4:46_1_1"/>
 <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> <a href="hidden.html#R1">=</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_1_1"><b>proof </b></a><div class="add">

<b>thus </b><a NAME="E1:46_1_1_1"/>
 <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> <a href="tarski.html#R1">c=</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
  <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D10">XBOOLE_0:def 10</a><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">p</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:46_1_1_1_1"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 ;<br/>

<b>then consider </b><font color="Maroon">f</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font><b> such that </b><br/><a NAME="E3:46_1_1_1_1"/><i><font color="Green">E63</font></i>: 
( <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> &amp; <font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> )
 <b>by </b><i/>;<br/>
<a NAME="E4:46_1_1_1_1"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 
<b>by </b><i><a class="ref" href="zf_fund1.html#D1" target="_self">Def1</a>, <a class="ref" href="zf_model.html#T6">ZF_MODEL:6</a></i>;<br/>
<b>hence </b><a NAME="E5:46_1_1_1_1"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 <b>by </b><i>, <a class="ref" href="zf_fund1.html#D1" target="_self">Def1</a>, </i>;<br/>


</div><b>end;</b></div>

<b>let </b><font color="Maroon">p</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E2:46_1_1_1"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 ;<br/>

<b>then consider </b><font color="Maroon">f</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font><b> such that </b><br/><a NAME="E4:46_1_1_1"/><i><font color="Green">E64</font></i>: 
( <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> &amp; <font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font> )
 <b>by </b><i/>;<br/>
<a NAME="E5:46_1_1_1"/>
for <font color="Olive">g</font> being  <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font>  st ( for <font color="Olive">v2</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="zf_lang.html#K1">VAR</a>   st <font color="Olive">g</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font> holds <br/><font color="Maroon">v1</font> <a href="hidden.html#R1">=</a> <font color="Olive">v2</font> ) holds <br/><font color="Olive">g</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_1_1_2"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">g</font> be   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font>;<br/>

<b>assume </b><a NAME="E1:46_1_1_1_2"/>
for <font color="Olive">v2</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="zf_lang.html#K1">VAR</a>   st <font color="Maroon">g</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font> holds <br/><font color="Maroon">v1</font> <a href="hidden.html#R1">=</a> <font color="Olive">v2</font>
 ;<br/>

<a NAME="E2:46_1_1_1_2"/><b>then </b><i><font color="Green">E65</font></i>: 
for <font color="Olive">v2</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="zf_lang.html#K1">VAR</a>   st <font color="Olive">v2</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font> holds <br/><font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">g</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font>
 
<b>by </b><i/>;<br/>
<a NAME="E3:46_1_1_1_2"/>
<font color="Maroon">E</font>,<font color="Maroon">f</font> <a href="zf_model.html#R1">|=</a> <font color="Maroon">H</font>
 
<b>by </b><i><a class="ref" href="zf_fund1.html#D1" target="_self">Def1</a>, <a class="ref" href="zf_model.html#D4">ZF_MODEL:def 4</a></i>;<br/>
<a NAME="E4:46_1_1_1_2"/><b>then </b>
<font color="Maroon">E</font>,<font color="Maroon">g</font> <a href="zf_model.html#R1">|=</a> <font color="Maroon">H</font>
 
<b>by </b><i>, <a class="ref" href="zf_lang1.html#T84">ZF_LANG1:84</a></i>;<br/>
<b>hence </b><a NAME="E5:46_1_1_1_2"/>
<font color="Maroon">g</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 <b>by </b><i><a class="ref" href="zf_model.html#D4">ZF_MODEL:def 4</a></i>;<br/>


</div><b>end;</b></div>
<a NAME="E6:46_1_1_1"/><b>then </b>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 
<b>by </b><i><a class="ref" href="zf_fund1.html#D1" target="_self">Def1</a>, <a class="ref" href="zf_model.html#T6">ZF_MODEL:6</a></i>;<br/>
<b>hence </b><a NAME="E7:46_1_1_1"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 <b>by </b><i>, <a class="ref" href="zf_fund1.html#D1" target="_self">Def1</a>, </i>;<br/>


</div><b>end;</b></div><b>hence </b><a NAME="E5:46_1_1"/>
 <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 <b>by </b><i/>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="46_1_2"><b>suppose </b></a><a NAME="E1:46_1_2"/><i><font color="Green">E66</font></i>: 
<font color="Maroon">v1</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font>
 ;<br/><div class="add"><b>set </b><font color="Maroon">n</font> =  <a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font>;<br/><b>set </b><font color="Maroon">fs</font> =  <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span>;<br/><a NAME="E2:46_1_2"/><i><font color="Green">E68</font></i>: 
 <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 <b>by </b><i>, , </i>;<br/><b>then reconsider </b><font color="Maroon">Dn</font> =  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> ;<br/><a NAME="E4:46_1_2"/><i><font color="Green">E69</font></i>: 
 <a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span>
 <b>by </b><i>, </i>;<br/><a NAME="E5:46_1_2"/>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span> <a href="tarski.html#R1">c=</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font>
 <b>by </b><i>, <a class="ref" href="zfmisc_1.html#T37">ZFMISC_1:37</a></i>;<br/><a NAME="E6:46_1_2"/><b>then </b>
 <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="subset_1.html#K4">\/</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span>
 <b>by </b><i><a class="ref" href="xboole_1.html#T45">XBOOLE_1:45</a></i>;<br/><b>then </b><i><font color="Green">E106</font></i>:  <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> = 
<span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="subset_1.html#K4">\/</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span></span>)</span>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="subset_1.html#K4">\/</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span>
<b>by </b><i/>
;<br/><i><font color="Green">E107</font></i>: <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> = 
<span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span></span>)</span>
<b>by </b><i/>
<br/>.= 
 <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v1</font></span><a href="domain_1.html#K6">}</a></span></span>)</span>
<b>by </b><i/>
;<br/><a NAME="E9:46_1_2"/><b>then </b><i><font color="Green">E108</font></i>: 
<span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> <a href="hidden.html#R1">=</a>  <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p2">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span></span>)</span>
 <b>by </b><i><a class="ref" href="zf_lang1.html#T67">ZF_LANG1:67</a></i>;<br/><a NAME="E10:46_1_2"/><i><font color="Green">E109</font></i>: 
 <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> <a href="tarski.html#R1">c=</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span>,<font color="Maroon">E</font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_3"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">p</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:46_1_2_3"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 ;<br/>

<a NAME="E2:46_1_2_3"/><b>then </b><i><font color="Green">E110</font></i>: 
 ex <font color="Olive">f</font> being  <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font> st <br/>( <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Olive">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> &amp; <font color="Olive">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E3:46_1_2_3"/>
 <a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font>
 
<b>by </b><i><a class="ref" href="zf_lang1.html#T65">ZF_LANG1:65</a></i>;<br/>
<b>hence </b><a NAME="E4:46_1_2_3"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span>,<font color="Maroon">E</font>
 <b>by </b><i>, </i>;<br/>


</div><b>end;</b></div><b>reconsider </b><font color="Maroon">m</font> = <font color="Maroon">E</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> <b>by </b><i/>;<br/><b>set </b><font color="Maroon">C</font> = <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span> ;<br/><a NAME="E12:46_1_2"/><i><font color="Green">E111</font></i>: 
<span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span>  <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 <b>by </b><i>, , <a class="ref" href="zf_fund1.html#D1" target="_self">Def1</a>, , </i>;<br/><a NAME="E13:46_1_2"/><i><font color="Green">E112</font></i>: 
 <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 <b>by </b><i>, </i>;<br/><a NAME="E14:46_1_2"/>
<span class="p1">(<span class="default"><a href="funct_2.html#K1">Funcs</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font></span>)</span> <a href="subset_1.html#K6">\</a> <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span>  <a href="hidden.html#R1">=</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4"><b>proof </b></a><div class="add">

<b>thus </b><a NAME="E1:46_1_2_4"/>
<span class="p1">(<span class="default"><a href="funct_2.html#K1">Funcs</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font></span>)</span> <a href="subset_1.html#K6">\</a> <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span>  <a href="tarski.html#R1">c=</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
  <i><font color="Red">:: according to </font></i><a class="ref" href="xboole_0.html#D10">XBOOLE_0:def 10</a><div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">p</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:46_1_2_4_1"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><a href="funct_2.html#K1">Funcs</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font></span>)</span> <a href="subset_1.html#K6">\</a> <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span> 
 ;<br/>

<a NAME="E2:46_1_2_4_1"/><b>then </b><i><font color="Green">E118</font></i>: 
( <font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp; not <font color="Maroon">p</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span>  )
 
<b>by </b><i><a class="ref" href="xboole_0.html#D4">XBOOLE_0:def 4</a></i>;<br/>
<b>then consider </b><font color="Maroon">h</font> being   <a href="funct_1.html#NM1">Function</a><b> such that </b><br/><a NAME="E4:46_1_2_4_1"/><i><font color="Green">E119</font></i>: 
( <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <font color="Maroon">h</font> &amp;  <a href="relat_1.html#K1">dom</a> <font color="Maroon">h</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> &amp;  <a href="relat_1.html#K2">rng</a> <font color="Maroon">h</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">E</font> )
 <b>by </b><i><a class="ref" href="funct_2.html#D2">FUNCT_2:def 2</a></i>;<br/>
<b>consider </b><font color="Maroon">f</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font><b> such that </b><br/><a NAME="E6:46_1_2_4_1"/><i><font color="Green">E120</font></i>: 
<font color="Maroon">h</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>
 <b>by </b><i>, , </i>;<br/>
<a NAME="E7:46_1_2_4_1"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_1_1"><b>proof </b></a><div class="add">

<a NAME="E1:46_1_2_4_1_1"/><i><font color="Green">E121</font></i>: 
for <font color="Olive">ff</font> being  <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font>  st <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Olive">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> holds <br/><font color="Olive">ff</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_1_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">ff</font> be   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font>;<br/>

<b>assume </b><a NAME="E1:46_1_2_4_1_1_1"/><i><font color="Green">E122</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span></span>)</span></span>)</span>
 ;<br/>

<b>assume </b><a NAME="E2:46_1_2_4_1_1_1"/>
not <font color="Maroon">ff</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 ;<br/>

<a NAME="E3:46_1_2_4_1_1_1"/><b>then </b>
<font color="Maroon">ff</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 
<b>by </b><i><a class="ref" href="zf_model.html#T4">ZF_MODEL:4</a></i>;<br/>
<a NAME="E4:46_1_2_4_1_1_1"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font>
 
<b>by </b><i/>;<br/>
<a NAME="E5:46_1_2_4_1_1_1"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="subset_1.html#K4">\/</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font>
 
<b>by </b><i>, <a class="txt" href="zf_fund1.html#E1:46"><i><font color="Green">E56</font></i></a>, <a class="ref" href="zf_lang1.html#T65">ZF_LANG1:65</a></i>;<br/>
<a NAME="E6:46_1_2_4_1_1_1"/><b>then </b><i><font color="Green">E123</font></i>: 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="relset_1.html#K1">\/</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font>
 
<b>by </b><i><a class="ref" href="relat_1.html#T107">RELAT_1:107</a></i>;<br/>
<a NAME="E7:46_1_2_4_1_1_1"/>
<span class="p1">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font>
 
<b>by </b><i/>;<br/>
<b>then reconsider </b><font color="Maroon">x</font> = <span class="p1">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> <b>by </b><i>, </i>;<br/>
<a NAME="E9:46_1_2_4_1_1_1"/>
 <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span>
 
<b>by </b><i/>;<br/>
<a NAME="E10:46_1_2_4_1_1_1"/><b>then </b>
<span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<span class="p3">(<span class="default"><span class="p4">(<span class="default"><span class="p5">(<span class="default"><font color="Maroon">ff</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p5"><a href="domain_1.html#K6">{</a><span class="default"><span class="p0">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="funct_1.html#K1">.</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span>)</span></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font>
 
<b>by </b><i><a class="txt" href="zf_fund1.html#E1:46_1_2"><i><font color="Green">E66</font></i></a>, <a class="ref" href="grfunc_1.html#T18">GRFUNC_1:18</a></i>;<br/>
<b>hence </b><a NAME="E11:46_1_2_4_1_1_1"/>
contradiction
 <b>by </b><i><a class="txt" href="zf_fund1.html#E2:46"><i><font color="Green">E57</font></i></a>, , </i>;<br/>


</div><b>end;</b></div>
<a NAME="E2:46_1_2_4_1_1"/><b>then </b><i><font color="Green">E124</font></i>: 
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 
<b>by </b><i><a class="txt" href="zf_fund1.html#E2:46"><i><font color="Green">E57</font></i></a>, , </i>;<br/>
<b>assume </b><a NAME="E3:46_1_2_4_1_1"/>
not <font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 ;<br/>

<b>then consider </b><font color="Maroon">e</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font><b> such that </b><br/><a NAME="E5:46_1_2_4_1_1"/><i><font color="Green">E125</font></i>: 
( ( for <font color="Olive">v2</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="zf_lang.html#K1">VAR</a>   st <font color="Maroon">e</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <font color="Olive">v2</font> holds <br/><font color="Olive">v2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v1</font> ) &amp; not <font color="Maroon">e</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font> )
 <b>by </b><i>, <a class="ref" href="zf_model.html#T6">ZF_MODEL:6</a></i>;<br/>
<a NAME="E6:46_1_2_4_1_1"/>
<span class="p1">(<span class="default"><font color="Maroon">e</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_1_1_2"><b>proof </b></a><div class="add">

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_1_1_2_1"><b>now </b></a><div class="add"><b>thus </b><a NAME="E1:46_1_2_4_1_1_2_1"/><i><font color="Green">E126</font></i>: 
( <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">e</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> &amp; <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> <a href="hidden.html#R1">=</a>  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> )
 <b>by </b><i/>;<br/><b>let </b><font color="Maroon">q</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E2:46_1_2_4_1_1_2_1"/><i><font color="Green">E127</font></i>: 
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span>
 ;<br/><a NAME="E3:46_1_2_4_1_1_2_1"/><b>then </b><i><font color="Green">E128</font></i>: 
( <font color="Maroon">q</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> &amp; not <font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> )
 <b>by </b><i><a class="ref" href="xboole_0.html#D4">XBOOLE_0:def 4</a></i>;<br/><b>reconsider </b><font color="Maroon">p''</font> = <font color="Maroon">q</font> as    <a href="subset_1.html#M1">Element</a> of  <a href="ordinal1.html#K5">omega</a>  <b>by </b><i><a class="txt" href="zf_fund1.html#E2:46_1_2"><i><font color="Green">E68</font></i></a></i>;<br/><a NAME="E5:46_1_2_4_1_1_2_1"/><i><font color="Green">E135</font></i>: 
<font color="Maroon">q</font> <a href="hidden.html#R1">=</a>  <a href="zf_fund1.html#K4" target="_self">x".</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K2">x.</a> <span class="p2">(<span class="default"><a href="card_1.html#K4">card</a> <font color="Maroon">p''</font></span>)</span></span>)</span>
 <b>by </b><i/>;<br/><a NAME="E6:46_1_2_4_1_1_2_1"/><b>then </b><i><font color="Green">E136</font></i>: 
 <a href="zf_lang.html#K2">x.</a> <span class="p1">(<span class="default"><a href="card_1.html#K4">card</a> <font color="Maroon">p''</font></span>)</span> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">v1</font>
 <b>by </b><i><a class="txt" href="zf_fund1.html#E4:46_1_2"><i><font color="Green">E69</font></i></a>, <a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/><b>thus </b><span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">e</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">q</font> = 
<span class="p1">(<span class="default"><font color="Maroon">e</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">q</font>
<b>by </b><i>, <a class="txt" href="zf_fund1.html#E2:46_1_2"><i><font color="Green">E68</font></i></a>, <a class="ref" href="funct_1.html#T70">FUNCT_1:70</a></i>
<br/>.= 
<font color="Maroon">e</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K2">x.</a> <span class="p2">(<span class="default"><a href="card_1.html#K4">card</a> <font color="Maroon">p''</font></span>)</span></span>)</span>
<b>by </b><i>, </i>
<br/>.= 
<font color="Maroon">f</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K2">x.</a> <span class="p2">(<span class="default"><a href="card_1.html#K4">card</a> <font color="Maroon">p''</font></span>)</span></span>)</span>
<b>by </b><i><a class="txt" href="zf_fund1.html#E1:46_1_2"><i><font color="Green">E66</font></i></a>, </i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">q</font>
<b>by </b><i>, </i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">q</font>
<b>by </b><i>, <a class="txt" href="zf_fund1.html#E2:46_1_2"><i><font color="Green">E68</font></i></a>, <a class="ref" href="funct_1.html#T70">FUNCT_1:70</a></i>
;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E2:46_1_2_4_1_1_2"/>
<span class="p1">(<span class="default"><font color="Maroon">e</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>
 <b>by </b><i><a class="ref" href="funct_1.html#T9">FUNCT_1:9</a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E7:46_1_2_4_1_1"/>
contradiction
 <b>by </b><i><a class="txt" href="zf_fund1.html#E2:46"><i><font color="Green">E57</font></i></a>, , , , <a class="txt" href="zf_fund1.html#E1:46_1_2"><i><font color="Green">E66</font></i></a></i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E8:46_1_2_4_1"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 <b>by </b><i><a class="txt" href="zf_fund1.html#E2:46"><i><font color="Green">E57</font></i></a>, , , </i>;<br/>


</div><b>end;</b></div>

<b>let </b><font color="Maroon">p</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E2:46_1_2_4"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 ;<br/>

<b>then consider </b><font color="Maroon">f</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font><b> such that </b><br/><a NAME="E4:46_1_2_4"/><i><font color="Green">E137</font></i>: 
( <font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> &amp; <font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> )
 <b>by </b><i/>;<br/>
<a NAME="E5:46_1_2_4"/><i><font color="Green">E138</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font>
 
<b>by </b><i><a class="txt" href="zf_fund1.html#E2:46"><i><font color="Green">E57</font></i></a>, , </i>;<br/>
<b>then reconsider </b><font color="Maroon">x</font> = <font color="Maroon">p</font> as    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> <b>by </b><i>, </i>;<br/>
<div><i><font color="Green">E139</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_2"><b>now </b></a><div class="add"><b>given </b><font color="Maroon">u</font> being    <a href="hidden.html#M1">set</a> <b> such that </b><a NAME="E1:46_1_2_4_2"/><i><font color="Green">E140</font></i>: 
<span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Maroon">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font>
 ;<br/><b>consider </b><font color="Maroon">h</font> being   <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font><b> such that </b><br/><a NAME="E3:46_1_2_4_2"/><i><font color="Green">E141</font></i>: 
<span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Maroon">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span>
 <b>by </b><i>, , </i>;<br/><a NAME="E4:46_1_2_4_2"/><i><font color="Green">E142</font></i>: 
 ex <font color="Olive">hh</font> being  <a href="funct_2.html#NM1">Function</a> of  <a href="zf_lang.html#K1">VAR</a> ,<font color="Maroon">E</font> st <br/>( <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Maroon">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Olive">hh</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p3">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> &amp; <font color="Olive">hh</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> )
 <b>by </b><i>, </i>;<br/><a NAME="E5:46_1_2_4_2"/>
 <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <span class="p2">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span></span>)</span>
 <b>by </b><i><a class="ref" href="zf_lang1.html#T65">ZF_LANG1:65</a></i>;<br/><a NAME="E6:46_1_2_4_2"/><b>then </b>
<font color="Maroon">h</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K6">'not'</a> <font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 <b>by </b><i>, <a class="txt" href="zf_fund1.html#E1:46_1_2"><i><font color="Green">E66</font></i></a>, </i>;<br/><a NAME="E7:46_1_2_4_2"/><b>then </b><i><font color="Green">E143</font></i>: 
not <font color="Maroon">h</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <font color="Maroon">H</font>,<font color="Maroon">E</font>
 <b>by </b><i><a class="ref" href="zf_model.html#T4">ZF_MODEL:4</a></i>;<br/><a NAME="E8:46_1_2_4_2"/>
<span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_2_1"><b>proof </b></a><div class="add">

<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_2_1_1"><b>now </b></a><div class="add"><b>thus </b><a NAME="E1:46_1_2_4_2_1_1"/><i><font color="Green">E144</font></i>: 
(  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> &amp;  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> )
 <b>by </b><i/>;<br/><b>let </b><font color="Maroon">q</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>assume </b><a NAME="E2:46_1_2_4_2_1_1"/><i><font color="Green">E145</font></i>: 
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span>
 ;<br/><b>reconsider </b><font color="Maroon">g</font> = <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Maroon">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> as   <a href="funct_1.html#NM1">Function</a> <b>by </b><i><a class="ref" href="grfunc_1.html#T15">GRFUNC_1:15</a></i>;<br/><a NAME="E4:46_1_2_4_2_1_1"/><i><font color="Green">E146</font></i>: 
<font color="Maroon">g</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Maroon">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span>
 ;<br/><a NAME="E5:46_1_2_4_2_1_1"/>
<span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span> <a href="tarski.html#R1">c=</a>  <a href="zf_fund1.html#K5" target="_self">code</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span>
 <b>by </b><i><a class="ref" href="xboole_1.html#T36">XBOOLE_1:36</a></i>;<br/><a NAME="E6:46_1_2_4_2_1_1"/><b>then </b>
<span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span>
 <b>by </b><i><a class="ref" href="relat_1.html#T104">RELAT_1:104</a></i>;<br/><b>hence </b><span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">q</font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">q</font>
<b>by </b><i><a class="txt" href="zf_fund1.html#E2:46_1_2"><i><font color="Green">E68</font></i></a>, <a class="txt" href="zf_fund1.html#E4:46_1_2"><i><font color="Green">E69</font></i></a>, <a class="ref" href="grfunc_1.html#T8">GRFUNC_1:8</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">q</font>
<b>by </b><i><a class="txt" href="zf_fund1.html#E2:46"><i><font color="Green">E57</font></i></a>, , , <a class="txt" href="zf_fund1.html#E2:46_1_2"><i><font color="Green">E68</font></i></a>, <a class="txt" href="zf_fund1.html#E4:46_1_2"><i><font color="Green">E69</font></i></a>, , <a class="ref" href="grfunc_1.html#T35">GRFUNC_1:35</a></i>
;<br/><br/></div><b>end;</b></div>
<b>hence </b><a NAME="E2:46_1_2_4_2_1"/>
<span class="p1">(<span class="default"><font color="Maroon">h</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="partfun1.html#K1">*</a> <a href="zf_fund1.html#K3" target="_self">decode</a> </span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>
 <b>by </b><i><a class="ref" href="funct_1.html#T9">FUNCT_1:9</a></i>;<br/>


</div><b>end;</b></div><a NAME="E9:46_1_2_4_2"/><b>then </b>
<font color="Maroon">h</font> <a href="hidden.html#R2">in</a>  <a href="zf_model.html#K5">St</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font>
 <b>by </b><i><a class="txt" href="zf_fund1.html#E2:46"><i><font color="Green">E57</font></i></a>, , </i>;<br/><b>hence </b><a NAME="E10:46_1_2_4_2"/>
contradiction
 <b>by </b><i>, <a class="ref" href="zf_model.html#T6">ZF_MODEL:6</a></i>;<br/></div><b>end;</b></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="46_1_2_4_3"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:46_1_2_4_3"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span> 
 ;<br/><a NAME="E2:46_1_2_4_3"/><b>then </b>
 ex <font color="Olive">y</font> being   <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> st <br/>( <font color="Olive">y</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> &amp; <font color="Olive">y</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">y</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> )
 ;<br/><b>hence </b><a NAME="E3:46_1_2_4_3"/>
contradiction
 <b>by </b><i/>;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E9:46_1_2_4"/>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a> <span class="p1">(<span class="default"><a href="funct_2.html#K1">Funcs</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p4">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p3"><a href="domain_1.html#K6">{</a><span class="default"><span class="p4">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font></span>)</span> <a href="subset_1.html#K6">\</a> <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">V</font> : ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="funct_2.html#K1">Funcs</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="zf_fund1.html#K5" target="_self">code</a> <span class="p3">(<span class="default"><a href="zf_fund1.html#K6" target="_self">Free</a> <font color="Maroon">H</font></span>)</span></span>)</span> <a href="subset_1.html#K7">\</a> <span class="p2"><a href="domain_1.html#K6">{</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span></span><a href="domain_1.html#K6">}</a></span></span>)</span>,<font color="Maroon">m</font> &amp;  ex <font color="Olive">u</font> being   <a href="hidden.html#M1">set</a>  st <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2"><a href="tarski.html#K4">[</a><span class="default"><span class="p3">(<span class="default"><a href="zf_fund1.html#K4" target="_self">x".</a> <font color="Maroon">v1</font></span>)</span>,<font color="Olive">u</font></span><a href="tarski.html#K4">]</a></span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <font color="Olive">x</font> <a href="hidden.html#R2">in</a> <font color="Maroon">Dn</font> ) </span>}</span> 
 <b>by </b><i>, <a class="ref" href="xboole_0.html#D4">XBOOLE_0:def 4</a></i>;<br/>


</div><b>end;</b></div><b>hence </b><a NAME="E15:46_1_2"/>
 <a href="zf_fund1.html#K7" target="_self">Diagram</a> <span class="p1">(<span class="default"><a href="zf_lang.html#K8">All</a> <font color="Maroon">v1</font>,<font color="Maroon">H</font></span>)</span>,<font color="Maroon">E</font> <a href="hidden.html#R2">in</a> <font color="Maroon">X</font>
 <b>by </b><i>, , , </i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

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