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<div class="add">

<b>let </b><font color="Maroon">S</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">R</font> be  <a href="partfun1.html#V1">total</a>  <a href="relset_1.html#M2">Relation</a> of <font color="Maroon">S</font>,<font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">BASSIGN</font> be  non <a href="xboole_0.html#V1">empty</a> <a href="subset_1.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="modelc_1.html#K32" target="_self">ModelSP</a> <font color="Maroon">S</font></span>)</span>;<br/><b>let </b><font color="Maroon">f</font> be   <a href="modelc_1.html#NM2">Assign</a> of <span class="p1">(<span class="default"><a href="modelc_1.html#K50" target="_self">CTLModel</a> <font color="Maroon">R</font>,<font color="Maroon">BASSIGN</font></span>)</span>;<br/><b>let </b><font color="Maroon">s</font> be    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">S</font>;<br/>









<b>thus </b><a NAME="E1:165"/>
( <font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font> implies <font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K55" target="_self">Fax</a> <font color="Maroon">f</font>,<span class="p1">(<span class="default"><a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font></span>)</span> )
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="165_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:165_1"/>
<font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font>
 ;<br/>

<b>then consider </b><font color="Maroon">pai</font> being    <a href="modelc_1.html#M1" target="_self">inf_path</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E3:165_1"/><i><font color="Green">E27</font></i>: 
<font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> 0 <a href="hidden.html#R1">=</a> <font color="Maroon">s</font>
 <b>and </b><br/><a NAME="E4:165_1"/><i><font color="Green">E28</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> <font color="Olive">n</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 <b>by </b><i/>;<br/>
<a NAME="E5:165_1"/><i><font color="Green">E50</font></i>: 
<font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="txt" href="modelc_1.html#E35"><i><font color="Green">Lemma125</font></i></a>, <a class="txt" href="modelc_1.html#E36"><i><font color="Green">Lemma126</font></i></a></i>;<br/>
<b>set </b><font color="Maroon">pai1</font> =  <a href="modelc_1.html#K57" target="_self">PathShift</a> <font color="Maroon">pai</font>,1;<br/>
<a NAME="E6:165_1"/><i><font color="Green">E52</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <span class="p1">(<span class="default"><a href="modelc_1.html#K57" target="_self">PathShift</a> <font color="Maroon">pai</font>,1</span>)</span> <a href="funct_2.html#K3">.</a> <font color="Olive">n</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="165_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<b>set </b><font color="Maroon">n1</font> = <font color="Maroon">n</font> <a href="binop_2.html#K23">+</a> 1;<br/>
<a NAME="E1:165_1_1"/>
<span class="p1">(<span class="default"><a href="modelc_1.html#K57" target="_self">PathShift</a> <font color="Maroon">pai</font>,1</span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">n</font> <a href="hidden.html#R1">=</a> <font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><font color="Maroon">n</font> <a href="binop_2.html#K23">+</a> 1</span>)</span>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E2:165_1_1"/>
<span class="p1">(<span class="default"><a href="modelc_1.html#K57" target="_self">PathShift</a> <font color="Maroon">pai</font>,1</span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">n</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 <b>by </b><i><a class="txt" href="modelc_1.html#E36"><i><font color="Green">Lemma126</font></i></a></i>;<br/>


</div><b>end;</b></div>
<b>set </b><font color="Maroon">g</font> =  <a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font>;<br/>
<a NAME="E7:165_1"/>
<font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default">0 <a href="binop_2.html#K23">+</a> 1</span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="modelc_1.html#K57" target="_self">PathShift</a> <font color="Maroon">pai</font>,1</span>)</span> <a href="funct_2.html#K3">.</a> 0
 
<b>by </b><i/>;<br/>
<a NAME="E8:165_1"/><b>then </b>
<font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> 1 <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font>
 
<b>by </b><i><a class="txt" href="modelc_1.html#E38"><i><font color="Green">Lemma128</font></i></a>, </i>;<br/>
<a NAME="E9:165_1"/><b>then </b>
<font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K27" target="_self">EX</a> <span class="p1">(<span class="default"><a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font></span>)</span>
 
<b>by </b><i><a class="txt" href="modelc_1.html#E35"><i><font color="Green">Lemma125</font></i></a>, </i>;<br/>
<b>hence </b><a NAME="E10:165_1"/>
<font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K55" target="_self">Fax</a> <font color="Maroon">f</font>,<span class="p1">(<span class="default"><a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font></span>)</span>
 <b>by </b><i><a class="txt" href="modelc_1.html#E37"><i><font color="Green">Lemma127</font></i></a>, </i>;<br/>


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

<b>set </b><font color="Maroon">g</font> =  <a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font>;<br/>
<b>assume </b><a NAME="E2:165"/><i><font color="Green">E53</font></i>: 
<font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K55" target="_self">Fax</a> <font color="Maroon">f</font>,<span class="p1">(<span class="default"><a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font></span>)</span>
 ;<br/>

<a NAME="E3:165"/><b>then </b>
( <font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font> &amp; <font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K27" target="_self">EX</a> <span class="p1">(<span class="default"><a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font></span>)</span> )
 
<b>by </b><i/>;<br/>
<b>then consider </b><font color="Maroon">pai1</font> being    <a href="modelc_1.html#M1" target="_self">inf_path</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E5:165"/><i><font color="Green">E54</font></i>: 
<font color="Maroon">pai1</font> <a href="funct_2.html#K3">.</a> 0 <a href="hidden.html#R1">=</a> <font color="Maroon">s</font>
 <b>and </b><br/><a NAME="E6:165"/><i><font color="Green">E55</font></i>: 
<font color="Maroon">pai1</font> <a href="funct_2.html#K3">.</a> 1 <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font>
 <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">pai2</font> being    <a href="modelc_1.html#M1" target="_self">inf_path</a> of <font color="Maroon">R</font><b> such that </b><br/><a NAME="E8:165"/><i><font color="Green">E56</font></i>: 
<font color="Maroon">pai2</font> <a href="funct_2.html#K3">.</a> 0 <a href="hidden.html#R1">=</a> <font color="Maroon">pai1</font> <a href="funct_2.html#K3">.</a> 1
 <b>and </b><br/><a NAME="E9:165"/><i><font color="Green">E57</font></i>: 
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">pai2</font> <a href="funct_2.html#K3">.</a> <font color="Olive">n</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 <b>by </b><i><a class="txt" href="modelc_1.html#E37"><i><font color="Green">Lemma127</font></i></a>, </i>;<br/>
<b>set </b><font color="Maroon">pai</font> =  <a href="modelc_1.html#K59" target="_self">PathConc</a> <font color="Maroon">pai1</font>,<font color="Maroon">pai2</font>,1;<br/>
<b>reconsider </b><font color="Maroon">pai</font> =  <a href="modelc_1.html#K59" target="_self">PathConc</a> <font color="Maroon">pai1</font>,<font color="Maroon">pai2</font>,1 as    <a href="modelc_1.html#M1" target="_self">inf_path</a> of <font color="Maroon">R</font> <b>by </b><i><a class="txt" href="modelc_1.html#E38"><i><font color="Green">Lemma128</font></i></a>, </i>;<br/>
<i><font color="Green">E58</font></i>: <font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> 0 = 
 <a href="modelc_1.html#K58" target="_self">PathChange</a> <font color="Maroon">pai1</font>,<font color="Maroon">pai2</font>,1,0
<b>by </b><i/>
<br/>.= 
<font color="Maroon">s</font>
<b>by </b><i>, <a class="txt" href="modelc_1.html#E36"><i><font color="Green">Lemma126</font></i></a></i>
;<br/>
<a NAME="E12:165"/>
for <font color="Olive">n</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  holds  <font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> <font color="Olive">n</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="165_3"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">n</font> be    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>

<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="165_3_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:165_3_1"/>
( <font color="Maroon">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 1 or  not <font color="Maroon">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 1 )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="165_3_1_1"><b>suppose </b></a><a NAME="E1:165_3_1_1"/><i><font color="Green">E59</font></i>: 
<font color="Maroon">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 1
 ;<br/><div class="add"><a NAME="E2:165_3_1_1"/>
<font color="Maroon">n</font> <a href="hidden.html#R1">=</a> 0
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="165_3_1_1_1"><b>proof </b></a><div class="add">

<b>assume </b><a NAME="E1:165_3_1_1_1"/><i><font color="Green">E60</font></i>: 
<font color="Maroon">n</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> 0
 ;<br/>

<a NAME="E2:165_3_1_1_1"/>
<font color="Maroon">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 0 <a href="binop_2.html#K23">+</a> 1
 
<b>by </b><i><a class="ref" href="modelc_1.html#D21" target="_self">Def21</a></i>;<br/>
<b>hence </b><a NAME="E3:165_3_1_1_1"/>
contradiction
 <b>by </b><i><a class="ref" href="nat_1.html#T70">NAT_1:70</a>, <a class="ref" href="modelc_1.html#D22" target="_self">Def22</a></i>;<br/>


</div><b>end;</b></div><b>hence </b><a NAME="E3:165_3_1_1"/>
<font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">n</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 <b>by </b><i><a class="txt" href="modelc_1.html#E35"><i><font color="Green">Lemma125</font></i></a>, , <a class="txt" href="modelc_1.html#E40"><i><font color="Green">Lemma130</font></i></a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="165_3_1_2"><b>suppose </b></a><a NAME="E1:165_3_1_2"/><i><font color="Green">E61</font></i>: 
not <font color="Maroon">n</font> <a href="xxreal_0.html#NR3" target="_self">&lt;</a> 1
 ;<br/><div class="add"><b>reconsider </b><font color="Maroon">m</font> = <font color="Maroon">n</font> <a href="binop_2.html#K10">-</a> 1 as    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a>  <b>by </b><i><a class="ref" href="modelc_1.html#D21" target="_self">Def21</a>, <a class="ref" href="nat_1.html#T61">NAT_1:61</a></i>;<br/><font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">n</font> = 
 <a href="modelc_1.html#K58" target="_self">PathChange</a> <font color="Maroon">pai1</font>,<font color="Maroon">pai2</font>,1,<font color="Maroon">n</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">pai2</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">m</font>
<b>by </b><i><a class="ref" href="modelc_1.html#D21" target="_self">Def21</a>, </i>
;<br/><b>hence </b><a NAME="E4:165_3_1_2"/>
<font color="Maroon">pai</font> <a href="funct_2.html#K3">.</a> <font color="Maroon">n</font> <a href="modelc_1.html#R3" target="_self">|=</a> <font color="Maroon">f</font>
 <b>by </b><i><a class="txt" href="modelc_1.html#E39"><i><font color="Green">Lemma129</font></i></a></i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

</div><b>end;</b></div>
<b>hence </b><a NAME="E13:165"/>
<font color="Maroon">s</font> <a href="modelc_1.html#R3" target="_self">|=</a>  <a href="modelc_1.html#K28" target="_self">EG</a> <font color="Maroon">f</font>
 <b>by </b><i><a class="txt" href="modelc_1.html#E40"><i><font color="Green">Lemma130</font></i></a>, </i>;<br/>


</div>
