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<b>let </b><font color="Maroon">A</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">C</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">F</font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">A</font>,<span class="p1"><a href="cat_2.html#K11">[:</a><span class="default"><font color="Maroon">B</font>,<font color="Maroon">C</font></span><a href="cat_2.html#K11">:]</a></span>, <font color="Maroon">G</font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">A</font>,<span class="p1"><a href="cat_2.html#K11">[:</a><span class="default"><font color="Maroon">B</font>,<font color="Maroon">C</font></span><a href="cat_2.html#K11">:]</a></span>;<br/>







<a NAME="E1:46"/>
the <a href="cat_1.html#U2">Morphisms</a> of <span class="p1"><a href="cat_2.html#K11">[:</a><span class="default"><font color="Maroon">B</font>,<font color="Maroon">C</font></span><a href="cat_2.html#K11">:]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default">the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font></span><a href="zfmisc_1.html#K2">:]</a></span>
 
<b>by </b><i><a class="ref" href="cat_2.html#T33">CAT_2:33</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">f</font> = <font color="Maroon">F</font>, <font color="Maroon">g</font> = <font color="Maroon">G</font> as   <a href="funct_2.html#NM1">Function</a> of the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">A</font>,<span class="p1"><a href="zfmisc_1.html#K2">[:</a><span class="default">the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font></span><a href="zfmisc_1.html#K2">:]</a></span> ;<br/>
<b>assume </b><a NAME="E3:46"/><i><font color="Green">E16</font></i>: 
 <a href="isocat_2.html#K11" target="_self">Pr1</a> <font color="Maroon">F</font> <a href="funct_2.html#R2">=</a>  <a href="isocat_2.html#K11" target="_self">Pr1</a> <font color="Maroon">G</font>
 ;<br/>

<i><font color="Green">E17</font></i>: <span class="p1">(<span class="default"><a href="funct_3.html#K9">pr1</a> the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font></span>)</span> <a href="partfun1.html#K1">*</a> <font color="Maroon">f</font> = 
 <a href="isocat_2.html#K11" target="_self">Pr1</a> <font color="Maroon">G</font>
<b>by </b><i><a class="ref" href="cat_2.html#D10">CAT_2:def 10</a>, </i>
<br/>.= 
<span class="p1">(<span class="default"><a href="funct_3.html#K9">pr1</a> the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font></span>)</span> <a href="partfun1.html#K1">*</a> <font color="Maroon">g</font>
<b>by </b><i><a class="ref" href="cat_2.html#D10">CAT_2:def 10</a></i>
;<br/>
<b>assume </b><a NAME="E5:46"/><i><font color="Green">E32</font></i>: 
 <a href="isocat_2.html#K12" target="_self">Pr2</a> <font color="Maroon">F</font> <a href="funct_2.html#R2">=</a>  <a href="isocat_2.html#K12" target="_self">Pr2</a> <font color="Maroon">G</font>
 ;<br/>

<span class="p1">(<span class="default"><a href="funct_3.html#K10">pr2</a> the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font></span>)</span> <a href="partfun1.html#K1">*</a> <font color="Maroon">f</font> = 
 <a href="isocat_2.html#K12" target="_self">Pr2</a> <font color="Maroon">G</font>
<b>by </b><i><a class="ref" href="cat_2.html#D11">CAT_2:def 11</a>, </i>
<br/>.= 
<span class="p1">(<span class="default"><a href="funct_3.html#K10">pr2</a> the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font></span>)</span> <a href="partfun1.html#K1">*</a> <font color="Maroon">g</font>
<b>by </b><i><a class="ref" href="cat_2.html#D11">CAT_2:def 11</a></i>
;<br/>
<b>hence </b><a NAME="E7:46"/>
<font color="Maroon">F</font> <a href="funct_2.html#R2">=</a> <font color="Maroon">G</font>
 <b>by </b><i>, </i>;<br/>


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