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<b>let </b><font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be  non <a href="struct_0.html#V3">empty</a> <a href="altcat_1.html#V2">transitive</a> <a href="altcat_1.html#V12">with_units</a>  <a href="altcat_1.html#L2">AltCatStr</a> ;<br/>

<b>given </b><font color="Maroon">c<sub>5</sub></font> being    <a href="functor0.html#M2" target="_self">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="E1:123_2_1"/><i><font color="Green">E81</font></i>: 
( <font color="Maroon">c<sub>5</sub></font> is <a href="functor0.html#V21" target="_self">bijective</a> &amp; <font color="Maroon">c<sub>5</sub></font> is <a href="functor0.html#V16" target="_self">contravariant</a> )
 ;<br/>

<b>consider </b><font color="Maroon">c<sub>6</sub></font> being    <a href="functor0.html#M2" target="_self">Functor</a> of <font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>3</sub></font><b> such that </b><br/><a NAME="E3:123_2_1"/>
<font color="Maroon">c<sub>6</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>5</sub></font> <a href="functor0.html#K15" target="_self">"</a> 
 <b>and </b><br/><a NAME="E4:123_2_1"/><i><font color="Green">E82</font></i>: 
( <font color="Maroon">c<sub>6</sub></font> is <a href="functor0.html#V21" target="_self">bijective</a> &amp; <font color="Maroon">c<sub>6</sub></font> is <a href="functor0.html#V16" target="_self">contravariant</a> )
 <b>by </b><i><a class="txt" href="functor0.html#E1:123_2_1"><i><font color="Green">E81</font></i></a>, <a class="ref" href="functor0.html#T50" target="_self">Th50</a></i>;<br/>
<b>take </b>
<font color="Maroon">c<sub>6</sub></font>
;<br/>

<b>thus </b><a NAME="E5:123_2_1"/>
( <font color="Maroon">c<sub>6</sub></font> is <a href="functor0.html#V21" target="_self">bijective</a> &amp; <font color="Maroon">c<sub>6</sub></font> is <a href="functor0.html#V16" target="_self">contravariant</a> )
 <b>by </b><i><a class="txt" href="functor0.html#E4:123_2_1"><i><font color="Green">E82</font></i></a></i>;<br/>


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