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<b>let </b><font color="Maroon">A</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> , <font color="Maroon">B</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">F</font> being    <a href="functor0.html#M2" target="_self">Functor</a> of <font color="Maroon">A</font>,<font color="Maroon">B</font><b> such that </b><a NAME="E1:123_2_1"/><i><font color="Green">E26</font></i>: 
( <font color="Maroon">F</font> is <a href="functor0.html#V21" target="_self">bijective</a> &amp; <font color="Maroon">F</font> is <a href="functor0.html#V16" target="_self">contravariant</a> )
 ;<br/>

<b>consider </b><font color="Maroon">G</font> being    <a href="functor0.html#M2" target="_self">Functor</a> of <font color="Maroon">B</font>,<font color="Maroon">A</font><b> such that </b><br/><a NAME="E3:123_2_1"/>
<font color="Maroon">G</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> <a href="functor0.html#K15" target="_self">"</a> 
 <b>and </b><br/><a NAME="E4:123_2_1"/><i><font color="Green">E30</font></i>: 
( <font color="Maroon">G</font> is <a href="functor0.html#V21" target="_self">bijective</a> &amp; <font color="Maroon">G</font> is <a href="functor0.html#V16" target="_self">contravariant</a> )
 <b>by </b><i>, </i>;<br/>
<b>take </b>
<font color="Maroon">G</font>
;<br/>

<b>thus </b><a NAME="E5:123_2_1"/>
( <font color="Maroon">G</font> is <a href="functor0.html#V21" target="_self">bijective</a> &amp; <font color="Maroon">G</font> is <a href="functor0.html#V16" target="_self">contravariant</a> )
 <b>by </b><i><a class="ref" href="functor0.html#T12" target="_self">Th12</a></i>;<br/>


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