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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">c<sub>5</sub></font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>6</sub></font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">c<sub>3</sub></font>,<font color="Maroon">c<sub>4</sub></font>;<br/>











<a NAME="E1:63"/>
( <font color="Maroon">c<sub>5</sub></font> <a href="cat_1.html#K14">*</a> <span class="p1">(<span class="default"><a href="cat_2.html#K17" target="_self">pr1</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font></span>)</span> is    <a href="cat_1.html#M2">Functor</a> of <span class="p1"><a href="cat_2.html#K11" target="_self">[:</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="cat_2.html#K11" target="_self">:]</a></span>,<font color="Maroon">c<sub>2</sub></font> &amp; <font color="Maroon">c<sub>6</sub></font> <a href="cat_1.html#K14">*</a> <span class="p1">(<span class="default"><a href="cat_2.html#K18" target="_self">pr2</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font></span>)</span> is    <a href="cat_1.html#M2">Functor</a> of <span class="p1"><a href="cat_2.html#K11" target="_self">[:</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="cat_2.html#K11" target="_self">:]</a></span>,<font color="Maroon">c<sub>4</sub></font> &amp; <span class="p1"><a href="cat_2.html#K9" target="_self">[:</a><span class="default"><font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>6</sub></font></span><a href="cat_2.html#K9" target="_self">:]</a></span> <a href="funct_2.html#R1">=</a> <span class="p1"><a href="cat_2.html#K19" target="_self">&lt;:</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>5</sub></font> <a href="cat_1.html#K14">*</a> <span class="p3">(<span class="default"><a href="cat_2.html#K17" target="_self">pr1</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">c<sub>6</sub></font> <a href="cat_1.html#K14">*</a> <span class="p3">(<span class="default"><a href="cat_2.html#K18" target="_self">pr2</a> <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font></span>)</span></span>)</span></span><a href="cat_2.html#K19" target="_self">:&gt;</a></span> )
 
<b>by </b><i><a class="ref" href="cat_2.html#T64" target="_self">Th64</a></i>;<br/>
<b>hence </b><a NAME="E2:63"/>
<span class="p1"><a href="cat_2.html#K9" target="_self">[:</a><span class="default"><font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>6</sub></font></span><a href="cat_2.html#K9" target="_self">:]</a></span> is    <a href="cat_1.html#M2">Functor</a> of <span class="p1"><a href="cat_2.html#K11" target="_self">[:</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font></span><a href="cat_2.html#K11" target="_self">:]</a></span>,<span class="p1"><a href="cat_2.html#K11" target="_self">[:</a><span class="default"><font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font></span><a href="cat_2.html#K11" target="_self">:]</a></span>
 ;<br/>


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