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<b>let </b><font color="Maroon">c<sub>1</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>let </b><font color="Maroon">c<sub>2</sub></font> be  non <a href="struct_0.html#V3">empty</a> <a href="altcat_1.html#V12">with_units</a>  <a href="altcat_1.html#L2">AltCatStr</a> ;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be    <a href="functor0.html#M2" target="_self">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="E1:120"/><i><font color="Green">E79</font></i>: 
( <font color="Maroon">c<sub>3</sub></font> is <a href="functor0.html#V16" target="_self">contravariant</a> &amp; <font color="Maroon">c<sub>3</sub></font> is <a href="functor0.html#V5" target="_self">onto</a> )
 ;<br/>

<a NAME="E2:120"/><b>then </b>
<font color="Maroon">c<sub>3</sub></font> is <a href="functor0.html#V11" target="_self">Contravariant</a>
 
<b>by </b><i><a class="ref" href="functor0.html#D28" target="_self">Def28</a></i>;<br/>
<b>hence </b><a NAME="E3:120"/>
<font color="Maroon">c<sub>3</sub></font> is <a href="functor0.html#V7" target="_self">coreflexive</a>
 <b>by </b><i><a class="txt" href="functor0.html#E1:120"><i><font color="Green">E79</font></i></a>, <a class="ref" href="functor0.html#T46" target="_self">Th46</a></i>;<br/>


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