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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="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>4</sub></font> be   <a href="index_1.html#NM9">Indexing</a> of <font color="Maroon">c<sub>2</sub></font>;<br/><b>let </b><font color="Maroon">c<sub>5</sub></font> be    <a href="index_1.html#M4" target="_self">TargetCat</a> of <font color="Maroon">c<sub>4</sub></font>;<br/>







<a NAME="E1:64"/>
(  <a href="cat_5.html#K7">Image</a> <font color="Maroon">c<sub>3</sub></font> is    <a href="cat_2.html#M3">Subcategory</a> of <font color="Maroon">c<sub>2</sub></font> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p1">(<span class="default"><a href="index_1.html#K16" target="_self">rng</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="funct_2.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font> )
 
<b>by </b><i><a class="ref" href="index_1.html#T11" target="_self">Th11</a></i>;<br/>
<a NAME="E2:64"/><b>then </b>
( <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p2">(<span class="default"><a href="index_1.html#K16" target="_self">rng</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="cat_1.html#K14">*</a> <font color="Maroon">c<sub>3</sub></font> <a href="funct_2.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font></span>)</span> <a href="cat_1.html#K14">*</a> <font color="Maroon">c<sub>3</sub></font> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K20" target="_self">*</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>2</sub></font>,<span class="p3">(<span class="default"><a href="index_1.html#K16" target="_self">rng</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="cat_1.html#K14">*</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="index_1.html#K19" target="_self">-indexing_of</a> <font color="Maroon">c<sub>1</sub></font> )
 
<b>by </b><i><a class="ref" href="index_1.html#D16" target="_self">Def16</a></i>;<br/>
<b>hence </b><a NAME="E3:64"/>
<font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K20" target="_self">*</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="index_1.html#K15" target="_self">-functor</a> <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>5</sub></font></span>)</span> <a href="cat_1.html#K14">*</a> <font color="Maroon">c<sub>3</sub></font></span>)</span> <a href="index_1.html#K19" target="_self">-indexing_of</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="index_1.html#T19" target="_self">Th19</a></i>;<br/>


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