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<b>let </b><font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be   <a href="cat_1.html#NM4">Category</a>;<br/>



<b>given </b><font color="Maroon">c<sub>5</sub></font> being    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font><b> such that </b><a NAME="E1:18_1_2"/><i><font color="Green">E16</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="isocat_1.html#NR1" target="_self">is_an_isomorphism</a> 
 ;<br/>

<b>take </b>
<font color="Maroon">c<sub>5</sub></font> <a href="isocat_1.html#K1" target="_self">"</a> 
;<br/>

<b>thus </b><a NAME="E2:18_1_2"/>
<font color="Maroon">c<sub>5</sub></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><a class="txt" href="isocat_1.html#E1:18_1_2"><i><font color="Green">E16</font></i></a>, <a class="ref" href="isocat_1.html#T13" target="_self">Th13</a></i>;<br/>


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