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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>given </b><font color="Maroon">F</font> being    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">A</font>,<font color="Maroon">B</font><b> such that </b><a NAME="E1:18_1_2"/><i><font color="Green">E18</font></i>: 
<font color="Maroon">F</font> <a href="isocat_1.html#NR1" target="_self">is_an_isomorphism</a> 
 ;<br/>

<b>take </b>
<font color="Maroon">F</font> <a href="isocat_1.html#K1" target="_self">"</a> 
;<br/>

<b>thus </b><a NAME="E2:18_1_2"/>
<font color="Maroon">F</font> <a href="isocat_1.html#K1" target="_self">"</a>  <a href="isocat_1.html#NR1" target="_self">is_an_isomorphism</a> 
 <b>by </b><i>, </i>;<br/>


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