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

<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ,   <a href="hidden.html#M1">set</a> ] <b>means </b>for <font color="Olive">l2</font>, <font color="Olive">l1</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font>  st <font color="Olive">l2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a<sub>1</sub></font> &amp; <font color="Olive">l1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">a<sub>2</sub></font> holds <br/>(  <a href="coh_sp.html#K6" target="_self">dom</a> <font color="Olive">l2</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K7" target="_self">cod</a> <font color="Olive">l1</font> &amp; <font color="Maroon">a<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">l2</font> <a href="coh_sp.html#K9" target="_self">*</a> <font color="Olive">l1</font> );<br/>
<a NAME="E1:43_3_1"/><i><font color="Green">E28</font></i>: 
for <font color="Olive">x</font>, <font color="Olive">y</font>, <font color="Olive">z</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp; <font color="Olive">y</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp; <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z</font>] holds <br/><font color="Olive">z</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_3_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">y</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">z</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:43_3_1_1"/>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp; <font color="Maroon">y</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> )
 ;<br/>

<b>then reconsider </b><font color="Maroon">l2</font> = <font color="Maroon">x</font>, <font color="Maroon">l1</font> = <font color="Maroon">y</font> as    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> ;<br/>
<b>assume </b><a NAME="E3:43_3_1_1"/>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>]
 ;<br/>

<a NAME="E4:43_3_1_1"/><b>then </b>
<font color="Maroon">z</font> <a href="hidden.html#R1">=</a> <font color="Maroon">l2</font> <a href="coh_sp.html#K9" target="_self">*</a> <font color="Maroon">l1</font>
 
;<br/>
<b>hence </b><a NAME="E5:43_3_1_1"/>
<font color="Maroon">z</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font>
 ;<br/>


</div><b>end;</b></div>
<a NAME="E2:43_3_1"/><i><font color="Green">E29</font></i>: 
for <font color="Olive">x</font>, <font color="Olive">y</font>, <font color="Olive">z1</font>, <font color="Olive">z2</font> being   <a href="hidden.html#M1">set</a>   st <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp; <font color="Olive">y</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp; <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z1</font>] &amp; <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z2</font>] holds <br/><font color="Olive">z1</font> <a href="hidden.html#R1">=</a> <font color="Olive">z2</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_3_1_2"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">y</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">z1</font> be    <a href="hidden.html#M1">set</a> , <font color="Maroon">z2</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:43_3_1_2"/>
( <font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp; <font color="Maroon">y</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> )
 ;<br/>

<b>then reconsider </b><font color="Maroon">l2</font> = <font color="Maroon">x</font>, <font color="Maroon">l1</font> = <font color="Maroon">y</font> as    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> ;<br/>
<b>assume </b><a NAME="E3:43_3_1_2"/>
( <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z1</font>] &amp; <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z2</font>] )
 ;<br/>

<a NAME="E4:43_3_1_2"/><b>then </b>
( <font color="Maroon">z1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">l2</font> <a href="coh_sp.html#K9" target="_self">*</a> <font color="Maroon">l1</font> &amp; <font color="Maroon">z2</font> <a href="hidden.html#R1">=</a> <font color="Maroon">l2</font> <a href="coh_sp.html#K9" target="_self">*</a> <font color="Maroon">l1</font> )
 
;<br/>
<b>hence </b><a NAME="E5:43_3_1_2"/>
<font color="Maroon">z1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">z2</font>
 ;<br/>


</div><b>end;</b></div>
<b>consider </b><font color="Maroon">h</font> being   <a href="partfun1.html#NM1">PartFunc</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2">(<span class="default"><a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font></span>)</span>,<span class="p2">(<span class="default"><a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font></span>)</span></span><a href="zfmisc_1.html#K2">:]</a></span>, <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font><b> such that </b><br/><a NAME="E4:43_3_1"/><i><font color="Green">E30</font></i>: 
for <font color="Olive">x</font>, <font color="Olive">y</font> being   <a href="hidden.html#M1">set</a>  holds <br/> ( <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">x</font>,<font color="Olive">y</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">h</font> iff ( <font color="Olive">x</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp; <font color="Olive">y</font> <a href="hidden.html#R2">in</a>  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> &amp;  ex <font color="Olive">z</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z</font>] ) )
 <b>and </b><br/><a NAME="E5:43_3_1"/><i><font color="Green">E33</font></i>: 
for <font color="Olive">x</font>, <font color="Olive">y</font> being   <a href="hidden.html#M1">set</a>   st <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">x</font>,<font color="Olive">y</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">h</font> holds <br/><font color="Maroon">S<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Maroon">h</font> <a href="funct_1.html#K1">.</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">x</font>,<font color="Olive">y</font></span><a href="tarski.html#K4">]</a></span>]
 <b>from </b><i><a class="ref" href="partfun1.html#S4">PARTFUN1:sch 4</a>(<a class="ref" href="coh_sp.html#D3" target="_self">Def3</a>, );<br/></i>
<b>take </b>
<font color="Maroon">h</font>
;<br/>

<b>thus </b><a NAME="E6:43_3_1"/><i><font color="Green">E34</font></i>: 
for <font color="Olive">l2</font>, <font color="Olive">l1</font> being   <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font> holds <br/> ( <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Olive">l2</font>,<font color="Olive">l1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">h</font> iff  <a href="coh_sp.html#K6" target="_self">dom</a> <font color="Olive">l2</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K7" target="_self">cod</a> <font color="Olive">l1</font> )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_3_1_3"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">l2</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">l1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font>;<br/>



<b>thus </b><a NAME="E1:43_3_1_3"/>
( <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">l2</font>,<font color="Maroon">l1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">h</font> implies  <a href="coh_sp.html#K6" target="_self">dom</a> <font color="Maroon">l2</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K7" target="_self">cod</a> <font color="Maroon">l1</font> )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="43_3_1_3_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:43_3_1_3_1"/>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">l2</font>,<font color="Maroon">l1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">h</font>
 ;<br/>

<a NAME="E2:43_3_1_3_1"/><b>then </b>
 ex <font color="Olive">z</font> being   <a href="hidden.html#M1">set</a>  st <font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">l2</font>,<font color="Maroon">l1</font>,<font color="Olive">z</font>]
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:43_3_1_3_1"/>
 <a href="coh_sp.html#K6" target="_self">dom</a> <font color="Maroon">l2</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K7" target="_self">cod</a> <font color="Maroon">l1</font>
 ;<br/>


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

<b>assume </b><a NAME="E2:43_3_1_3"/>
 <a href="coh_sp.html#K6" target="_self">dom</a> <font color="Maroon">l2</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K7" target="_self">cod</a> <font color="Maroon">l1</font>
 ;<br/>

<a NAME="E3:43_3_1_3"/><b>then </b>
<font color="Maroon">S<sub>1</sub></font>[<font color="Maroon">l2</font>,<font color="Maroon">l1</font>,<font color="Maroon">l2</font> <a href="coh_sp.html#K9" target="_self">*</a> <font color="Maroon">l1</font>]
 
;<br/>
<b>hence </b><a NAME="E4:43_3_1_3"/>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">l2</font>,<font color="Maroon">l1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">h</font>
 <b>by </b><i/>;<br/>


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

<b>let </b><font color="Maroon">l2</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font>;<br/><b>let </b><font color="Maroon">l1</font> be    <a href="subset_1.html#M1">Element</a> of  <a href="coh_sp.html#K5" target="_self">MapsC</a> <font color="Maroon">X</font>;<br/>



<b>assume </b><a NAME="E7:43_3_1"/>
 <a href="coh_sp.html#K6" target="_self">dom</a> <font color="Maroon">l2</font> <a href="hidden.html#R1">=</a>  <a href="coh_sp.html#K7" target="_self">cod</a> <font color="Maroon">l1</font>
 ;<br/>

<a NAME="E8:43_3_1"/><b>then </b>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">l2</font>,<font color="Maroon">l1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K4">dom</a> <font color="Maroon">h</font>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E9:43_3_1"/>
<font color="Maroon">h</font> <a href="funct_1.html#K1">.</a> <span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">l2</font>,<font color="Maroon">l1</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R1">=</a> <font color="Maroon">l2</font> <a href="coh_sp.html#K9" target="_self">*</a> <font color="Maroon">l1</font>
 <b>by </b><i/>;<br/>


</div>
