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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be   <a href="altcat_1.html#NM4">category</a>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="functor0.html#M2">Functor</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/>



<b>assume </b><a NAME="E1:4"/><i><font color="Green">E5</font></i>: 
<font color="Maroon">c<sub>3</sub></font> is <a href="functor0.html#V21">bijective</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon">c<sub>4</sub></font> = <font color="Maroon">c<sub>3</sub></font> <a href="functor0.html#K15">"</a>  as  <a href="functor0.html#V8">feasible</a>  <a href="functor0.html#L2">FunctorStr</a> of <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font> <b>by </b><i><a class="ref" href="functor0.html#T36">FUNCTOR0:36</a></i>;<br/>
<b>let </b><font color="Maroon">c<sub>5</sub></font> be    <a href="functor0.html#M2">Functor</a> of <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>1</sub></font>;<br/>

<b>assume </b><a NAME="E3:4"/><i><font color="Green">E6</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="functor0.html#K13">*</a> <font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a>  <a href="functor0.html#K12">id</a> <font color="Maroon">c<sub>2</sub></font>
 ;<br/>

<a NAME="E4:4"/>
<span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="functor0.html#K15">"</a> </span>)</span> <a href="functor0.html#K13">*</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="functor0.html#K12">id</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="yellow20.html#E1:4"><i><font color="Green">E5</font></i></a>, <a class="ref" href="functor1.html#T22">FUNCTOR1:22</a></i>;<br/>
<b>then </b><span class="p1">(<span class="default"><a href="functor0.html#K12">id</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> <a href="functor0.html#K13">*</a> <font color="Maroon">c<sub>5</sub></font> = 
<font color="Maroon">c<sub>4</sub></font> <a href="functor0.html#K13">*</a> <span class="p1">(<span class="default"><a href="functor0.html#K12">id</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
<b>by </b><i><a class="txt" href="yellow20.html#E3:4"><i><font color="Green">E6</font></i></a>, <a class="ref" href="functor0.html#T33">FUNCTOR0:33</a></i>
<br/>.= 
<font color="Maroon">c<sub>3</sub></font> <a href="functor0.html#K15">"</a> 
<b>by </b><i><a class="ref" href="functor3.html#T5">FUNCTOR3:5</a></i>
;<br/>
<b>hence </b><a NAME="E6:4"/>
 <a href="functor0.html#G2">FunctorStr</a>(# the <a href="functor0.html#U1">ObjectMap</a> of <font color="Maroon">c<sub>5</sub></font>,the <a href="functor0.html#U2">MorphMap</a> of <font color="Maroon">c<sub>5</sub></font> #) <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>3</sub></font> <a href="functor0.html#K15">"</a> 
 <b>by </b><i><a class="ref" href="functor3.html#T4">FUNCTOR3:4</a></i>;<br/>


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