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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="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="funct_2.html#NM1">Function</a> of the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">c<sub>1</sub></font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">c<sub>2</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>4</sub></font> be   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>







<b>thus </b><span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="oppcat_1.html#K8" target="_self">*'</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="oppcat_1.html#K9" target="_self">*'</a> </span>)</span> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="oppcat_1.html#K5" target="_self">opp</a> </span>)</span> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#K3">.</a> <span class="p2">(<span class="default"><a href="oppcat_1.html#K6" target="_self">opp</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="oppcat_1.html#K5" target="_self">opp</a> </span>)</span></span>)</span></span>)</span> <a href="oppcat_1.html#K5" target="_self">opp</a> 
<b>by </b><i><a class="txt" href="oppcat_1.html#E69"><i><font color="Green">Lemma39</font></i></a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#K3">.</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="oppcat_1.html#K5" target="_self">opp</a> 

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