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<b>let </b><font color="Maroon">c<sub>5</sub></font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>

<b>thus </b><a NAME="E1:43_1_1"/>
<font color="Maroon">c<sub>5</sub></font> <a href="nattra_1.html#R2" target="_self">is_naturally_transformable_to</a> <font color="Maroon">c<sub>5</sub></font>
 ;<br/>

<b>take </b>
 <a href="nattra_1.html#K7" target="_self">id</a> <font color="Maroon">c<sub>5</sub></font>
;<br/>

<b>let </b><font color="Maroon">c<sub>6</sub></font> be   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">c<sub>1</sub></font>; <i><font color="Red">:: according to </font></i><a class="ref" href="nattra_1.html#D10" target="_self">NATTRA_1:def 10</a><br/>

<a NAME="E2:43_1_1"/>
<span class="p1">(<span class="default"><a href="nattra_1.html#K7" target="_self">id</a> <font color="Maroon">c<sub>5</sub></font></span>)</span> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10">id</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="cat_1.html#K13">.</a> <font color="Maroon">c<sub>6</sub></font></span>)</span>
 
<b>by </b><i><a class="ref" href="nattra_1.html#T21" target="_self">Th21</a></i>;<br/>
<b>hence </b><a NAME="E3:43_1_1"/>
<span class="p1">(<span class="default"><a href="nattra_1.html#K7" target="_self">id</a> <font color="Maroon">c<sub>5</sub></font></span>)</span> <a href="nattra_1.html#K5" target="_self">.</a> <font color="Maroon">c<sub>6</sub></font> is <a href="cat_1.html#V5">invertible</a>
 <b>by </b><i><a class="ref" href="cat_1.html#T74">CAT_1:74</a></i>;<br/>


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