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<b>let </b><font color="Maroon">C</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">D</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">F</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</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">D</font>;<br/><b>let </b><font color="Maroon">f</font> be   <a href="cat_1.html#NM2">Morphism</a> of <span class="p1">(<span class="default"><font color="Maroon">C</font> <a href="oppcat_1.html#K2" target="_self">opp</a> </span>)</span>;<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">F</font></span>)</span> <a href="oppcat_1.html#K9" target="_self">*'</a> </span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">f</font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="oppcat_1.html#K8" target="_self">*'</a> <font color="Maroon">F</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">f</font></span>)</span> <a href="oppcat_1.html#K5" target="_self">opp</a> 
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="funct_2.html#K3">.</a> <span class="p2">(<span class="default"><a href="oppcat_1.html#K6" target="_self">opp</a> <font color="Maroon">f</font></span>)</span></span>)</span> <a href="oppcat_1.html#K5" target="_self">opp</a> 
<b>by </b><i/>
;<br/>


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