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<b>let </b><font color="Maroon">B</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><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">T</font> be    <a href="cat_1.html#M2" target="_self">Functor</a> of <font color="Maroon">B</font>,<font color="Maroon">C</font>;<br/><b>let </b><font color="Maroon">S</font> be    <a href="cat_1.html#M2" target="_self">Functor</a> of <font color="Maroon">C</font>,<font color="Maroon">D</font>;<br/><b>let </b><font color="Maroon">b</font> be   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">B</font>;<br/>











<b>consider </b><font color="Maroon">d</font> being   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">D</font><b> such that </b><br/><a NAME="E2:94"/><i><font color="Green">E20</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">S</font> <a href="cat_1.html#K14" target="_self">*</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">b</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">d</font>
 <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">c</font> being   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">C</font><b> such that </b><br/><a NAME="E4:94"/><i><font color="Green">E21</font></i>: 
<font color="Maroon">T</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">b</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">c</font>
 <b>by </b><i/>;<br/>
<a NAME="E5:94"/><i><font color="Green">E22</font></i>: 
<span class="p1">(<span class="default"><font color="Maroon">S</font> <a href="cat_1.html#K14" target="_self">*</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">b</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">S</font> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><font color="Maroon">T</font> <a href="funct_2.html#K3">.</a> <span class="p2">(<span class="default"><a href="cat_1.html#K10" target="_self">id</a> <font color="Maroon">b</font></span>)</span></span>)</span>
 
<b>by </b><i><a class="ref" href="funct_2.html#T21">FUNCT_2:21</a></i>;<br/>
<b>thus </b><span class="p1">(<span class="default"><a href="cat_1.html#K12" target="_self">Obj</a> <span class="p2">(<span class="default"><font color="Maroon">S</font> <a href="cat_1.html#K14" target="_self">*</a> <font color="Maroon">T</font></span>)</span></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">b</font> = 
<font color="Maroon">d</font>
<b>by </b><i>, </i>
<br/>.= 
<span class="p1">(<span class="default"><a href="cat_1.html#K12" target="_self">Obj</a> <font color="Maroon">S</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">c</font>
<b>by </b><i>, <a class="ref" href="cat_1.html#T34" target="_self">Th34</a>, <a class="ref" href="cat_1.html#T35" target="_self">Th35</a>, </i>
<br/>.= 
<span class="p1">(<span class="default"><a href="cat_1.html#K12" target="_self">Obj</a> <font color="Maroon">S</font></span>)</span> <a href="funct_2.html#K3">.</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="cat_1.html#K12" target="_self">Obj</a> <font color="Maroon">T</font></span>)</span> <a href="funct_2.html#K3">.</a> <font color="Maroon">b</font></span>)</span>
<b>by </b><i><a class="ref" href="cat_1.html#T34" target="_self">Th34</a>, </i>
;<br/>


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