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

<b>set </b><font color="Maroon">X</font> = <span class="p1">{<span class="default"> <span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">o1</font>,<font color="Olive">o2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">g</font>,<font color="Olive">h</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> where <font color="Olive">g</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">C</font>, <font color="Olive">h</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">D</font>, <font color="Olive">o1</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font>, <font color="Olive">o2</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> : (  <a href="cat_1.html#K2">dom</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K2">dom</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K15">`12</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K15">`12</a>  &amp; <span class="p1">(<span class="default"><font color="Olive">o2</font> <a href="domain_1.html#K3">`2</a> </span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Olive">g</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Olive">h</font></span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Olive">o1</font> <a href="domain_1.html#K3">`2</a> </span>)</span> ) </span>}</span> ;<br/>
<a NAME="E1:4_1_1"/>
 <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">c</font>,<font color="Olive">d</font></span><a href="domain_1.html#K1">]</a></span>,<font color="Olive">f</font></span><a href="domain_1.html#K1">]</a></span> where <font color="Olive">c</font> is   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">C</font>, <font color="Olive">d</font> is   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">D</font>, <font color="Olive">f</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">E</font> : <font color="Olive">f</font> <a href="hidden.html#R2">in</a>  <a href="cat_1.html#K6">Hom</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="cat_1.html#K13">.</a> <font color="Olive">c</font></span>)</span>,<span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="cat_1.html#K13">.</a> <font color="Olive">d</font></span>)</span> </span>}</span> 
 
<b>by </b><i>, </i>;<br/>
<a NAME="E2:4_1_1"/><b>then </b>
<span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">c1</font>,<font color="Maroon">d1</font></span><a href="domain_1.html#K1">]</a></span>,<font color="Maroon">f1</font></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R2">in</a>  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font>
 
<b>by </b><i/>;<br/>
<b>then reconsider </b><font color="Maroon">o</font> = <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">c1</font>,<font color="Maroon">d1</font></span><a href="domain_1.html#K1">]</a></span>,<font color="Maroon">f1</font></span><a href="domain_1.html#K1">]</a></span> as    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> ;<br/>
<a NAME="E4:4_1_1"/>
(  <a href="cat_1.html#K2">dom</a> <font color="Maroon">f1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="cat_1.html#K13">.</a> <font color="Maroon">c1</font> &amp;  <a href="cat_1.html#K3">cod</a> <font color="Maroon">f1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">G</font> <a href="cat_1.html#K13">.</a> <font color="Maroon">d1</font> )
 
<b>by </b><i>, <a class="ref" href="cat_1.html#T18">CAT_1:18</a></i>;<br/>
<a NAME="E5:4_1_1"/><b>then </b>
(  <a href="cat_1.html#K2">dom</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">c1</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c1</font> &amp;  <a href="cat_1.html#K3">cod</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">c1</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c1</font> &amp;  <a href="cat_1.html#K2">dom</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">d1</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">d1</font> &amp;  <a href="cat_1.html#K3">cod</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">d1</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">d1</font> &amp; <span class="p1">(<span class="default"><font color="Maroon">o</font> <a href="domain_1.html#K2">`1</a> </span>)</span> <a href="domain_1.html#K2">`1</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">o</font> <a href="domain_1.html#K14">`11</a>  &amp; <span class="p1">(<span class="default"><font color="Maroon">o</font> <a href="domain_1.html#K2">`1</a> </span>)</span> <a href="domain_1.html#K3">`2</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">o</font> <a href="domain_1.html#K15">`12</a>  &amp; <font color="Maroon">o</font> <a href="domain_1.html#K2">`1</a>  <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">c1</font>,<font color="Maroon">d1</font></span><a href="domain_1.html#K1">]</a></span> &amp; <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">c1</font>,<font color="Maroon">d1</font></span><a href="domain_1.html#K1">]</a></span> <a href="domain_1.html#K2">`1</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">c1</font> &amp; <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">c1</font>,<font color="Maroon">d1</font></span><a href="domain_1.html#K1">]</a></span> <a href="domain_1.html#K3">`2</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">d1</font> &amp; <font color="Maroon">o</font> <a href="domain_1.html#K3">`2</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">f1</font> &amp; <font color="Maroon">f1</font> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <span class="p2">(<span class="default"><font color="Maroon">F</font> <a href="cat_1.html#K13">.</a> <font color="Maroon">c1</font></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">f1</font> &amp; <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <span class="p2">(<span class="default"><font color="Maroon">G</font> <a href="cat_1.html#K13">.</a> <font color="Maroon">d1</font></span>)</span></span>)</span> <a href="cat_1.html#K4">*</a> <font color="Maroon">f1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">f1</font> &amp; <font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">c1</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10">id</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="cat_1.html#K13">.</a> <font color="Maroon">c1</font></span>)</span> &amp; <font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">d1</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10">id</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="cat_1.html#K13">.</a> <font color="Maroon">d1</font></span>)</span> )
 
<b>by </b><i><a class="ref" href="mcart_1.html#D14">MCART_1:def 14</a>, <a class="ref" href="mcart_1.html#D15">MCART_1:def 15</a>, <a class="ref" href="cat_1.html#T44">CAT_1:44</a>, <a class="ref" href="cat_1.html#T46">CAT_1:46</a>, <a class="ref" href="cat_1.html#T47">CAT_1:47</a>, <a class="ref" href="cat_1.html#T108">CAT_1:108</a>, <a class="ref" href="mcart_1.html#T7">MCART_1:7</a></i>;<br/>
<a NAME="E6:4_1_1"/><b>then </b><i><font color="Green">E34</font></i>: 
<span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Maroon">o</font>,<font color="Maroon">o</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">c1</font></span>)</span>,<span class="p3">(<span class="default"><a href="cat_1.html#K10">id</a> <font color="Maroon">d1</font></span>)</span></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">o1</font>,<font color="Olive">o2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">g</font>,<font color="Olive">h</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> where <font color="Olive">g</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">C</font>, <font color="Olive">h</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">D</font>, <font color="Olive">o1</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font>, <font color="Olive">o2</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> : (  <a href="cat_1.html#K2">dom</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K2">dom</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K15">`12</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K15">`12</a>  &amp; <span class="p1">(<span class="default"><font color="Olive">o2</font> <a href="domain_1.html#K3">`2</a> </span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Olive">g</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Olive">h</font></span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Olive">o1</font> <a href="domain_1.html#K3">`2</a> </span>)</span> ) </span>}</span> 
 
;<br/>
<a NAME="E7:4_1_1"/>
<span class="p1">{<span class="default"> <span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">o1</font>,<font color="Olive">o2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">g</font>,<font color="Olive">h</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> where <font color="Olive">g</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">C</font>, <font color="Olive">h</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">D</font>, <font color="Olive">o1</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font>, <font color="Olive">o2</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> : (  <a href="cat_1.html#K2">dom</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K2">dom</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K15">`12</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K15">`12</a>  &amp; <span class="p1">(<span class="default"><font color="Olive">o2</font> <a href="domain_1.html#K3">`2</a> </span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Olive">g</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Olive">h</font></span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Olive">o1</font> <a href="domain_1.html#K3">`2</a> </span>)</span> ) </span>}</span>  <a href="tarski.html#R1">c=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="mcart_1.html#K12">[:</a><span class="default"><span class="p3">(<span class="default"><a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font></span>)</span>,<span class="p3">(<span class="default"><a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font></span>)</span></span><a href="mcart_1.html#K12">:]</a></span>,<span class="p2"><a href="zfmisc_1.html#K2">[:</a><span class="default">the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">D</font></span><a href="zfmisc_1.html#K2">:]</a></span></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="4_1_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> ; <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="E1:4_1_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">o1</font>,<font color="Olive">o2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">g</font>,<font color="Olive">h</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> where <font color="Olive">g</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">C</font>, <font color="Olive">h</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">D</font>, <font color="Olive">o1</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font>, <font color="Olive">o2</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> : (  <a href="cat_1.html#K2">dom</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K2">dom</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K15">`12</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K15">`12</a>  &amp; <span class="p1">(<span class="default"><font color="Olive">o2</font> <a href="domain_1.html#K3">`2</a> </span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Olive">g</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Olive">h</font></span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Olive">o1</font> <a href="domain_1.html#K3">`2</a> </span>)</span> ) </span>}</span> 
 ;<br/>

<a NAME="E2:4_1_1_1"/><b>then </b>
 ex <font color="Olive">g</font> being  <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">C</font> ex <font color="Olive">h</font> being  <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">D</font> ex <font color="Olive">o1</font>, <font color="Olive">o2</font> being   <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> st <br/>( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="domain_1.html#K1">[</a><span class="default"><span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">o1</font>,<font color="Olive">o2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">g</font>,<font color="Olive">h</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> &amp;  <a href="cat_1.html#K2">dom</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K2">dom</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K15">`12</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K15">`12</a>  &amp; <span class="p1">(<span class="default"><font color="Olive">o2</font> <a href="domain_1.html#K3">`2</a> </span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Olive">g</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Olive">h</font></span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Olive">o1</font> <a href="domain_1.html#K3">`2</a> </span>)</span> )
 
;<br/>
<b>hence </b><a NAME="E3:4_1_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="mcart_1.html#K12">[:</a><span class="default"><span class="p3">(<span class="default"><a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font></span>)</span>,<span class="p3">(<span class="default"><a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font></span>)</span></span><a href="mcart_1.html#K12">:]</a></span>,<span class="p2"><a href="zfmisc_1.html#K2">[:</a><span class="default">the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">D</font></span><a href="zfmisc_1.html#K2">:]</a></span></span><a href="zfmisc_1.html#K2">:]</a></span>
 ;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E8:4_1_1"/>
<span class="p1">{<span class="default"> <span class="p2"><a href="domain_1.html#K1">[</a><span class="default"><span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">o1</font>,<font color="Olive">o2</font></span><a href="domain_1.html#K1">]</a></span>,<span class="p3"><a href="domain_1.html#K1">[</a><span class="default"><font color="Olive">g</font>,<font color="Olive">h</font></span><a href="domain_1.html#K1">]</a></span></span><a href="domain_1.html#K1">]</a></span> where <font color="Olive">g</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">C</font>, <font color="Olive">h</font> is   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">D</font>, <font color="Olive">o1</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font>, <font color="Olive">o2</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font> : (  <a href="cat_1.html#K2">dom</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">g</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K14">`11</a>  &amp;  <a href="cat_1.html#K2">dom</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o1</font> <a href="domain_1.html#K15">`12</a>  &amp;  <a href="cat_1.html#K3">cod</a> <font color="Olive">h</font> <a href="hidden.html#R1">=</a> <font color="Olive">o2</font> <a href="domain_1.html#K15">`12</a>  &amp; <span class="p1">(<span class="default"><font color="Olive">o2</font> <a href="domain_1.html#K3">`2</a> </span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <font color="Olive">g</font></span>)</span> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">G</font> <a href="funct_2.html#K3">.</a> <font color="Olive">h</font></span>)</span> <a href="cat_1.html#K4">*</a> <span class="p1">(<span class="default"><font color="Olive">o1</font> <a href="domain_1.html#K3">`2</a> </span>)</span> ) </span>}</span>  is  non <a href="xboole_0.html#V1">empty</a> <a href="subset_1.html#NM2">Subset</a> of <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default"><span class="p2"><a href="mcart_1.html#K12">[:</a><span class="default"><span class="p3">(<span class="default"><a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font></span>)</span>,<span class="p3">(<span class="default"><a href="commacat.html#K1" target="_self">commaObjs</a> <font color="Maroon">F</font>,<font color="Maroon">G</font></span>)</span></span><a href="mcart_1.html#K12">:]</a></span>,<span class="p2"><a href="zfmisc_1.html#K2">[:</a><span class="default">the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">D</font></span><a href="zfmisc_1.html#K2">:]</a></span></span><a href="zfmisc_1.html#K2">:]</a></span>
 <b>by </b><i/>;<br/>


</div>
