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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>assume </b><b>that </b><br/><a NAME="E1:70"/><i><font color="Green">E54</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="nattra_1.html#V2" target="_self">discrete</a>
 <b>and </b><br/><a NAME="E2:70"/><i><font color="Green">E55</font></i>: 
<font color="Maroon">c<sub>2</sub></font> is <a href="nattra_1.html#V2" target="_self">discrete</a>
 ;<br/>

<b>let </b><font color="Maroon">c<sub>3</sub></font> be   <a href="cat_1.html#NM2">Morphism</a> of <span class="p1"><a href="cat_2.html#K11">[:</a><span class="default"><font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>2</sub></font></span><a href="cat_2.html#K11">:]</a></span>; <i><font color="Red">:: according to </font></i><a class="ref" href="nattra_1.html#D19" target="_self">NATTRA_1:def 19</a><br/>

<b>consider </b><font color="Maroon">c<sub>4</sub></font> being   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>5</sub></font> being   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">c<sub>2</sub></font><b> such that </b><br/><a NAME="E4:70"/><i><font color="Green">E56</font></i>: 
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="cat_2.html#K13">[</a><span class="default"><font color="Maroon">c<sub>4</sub></font>,<font color="Maroon">c<sub>5</sub></font></span><a href="cat_2.html#K13">]</a></span>
 <b>by </b><i><a class="ref" href="domain_1.html#T9">DOMAIN_1:9</a></i>;<br/>
<b>consider </b><font color="Maroon">c<sub>6</sub></font> being   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">c<sub>1</sub></font><b> such that </b><br/><a NAME="E6:70"/><i><font color="Green">E57</font></i>: 
<font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10">id</a> <font color="Maroon">c<sub>6</sub></font>
 <b>by </b><i><a class="txt" href="nattra_1.html#E1:70"><i><font color="Green">E54</font></i></a>, <a class="ref" href="nattra_1.html#D19" target="_self">Def19</a></i>;<br/>
<b>consider </b><font color="Maroon">c<sub>7</sub></font> being   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">c<sub>2</sub></font><b> such that </b><br/><a NAME="E8:70"/><i><font color="Green">E58</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10">id</a> <font color="Maroon">c<sub>7</sub></font>
 <b>by </b><i><a class="txt" href="nattra_1.html#E2:70"><i><font color="Green">E55</font></i></a>, <a class="ref" href="nattra_1.html#D19" target="_self">Def19</a></i>;<br/>
<b>take </b>
<span class="p1"><a href="cat_2.html#K12">[</a><span class="default"><font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span><a href="cat_2.html#K12">]</a></span>
;<br/>

<b>thus </b><a NAME="E9:70"/>
<font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="cat_1.html#K10">id</a> <span class="p1"><a href="cat_2.html#K12">[</a><span class="default"><font color="Maroon">c<sub>6</sub></font>,<font color="Maroon">c<sub>7</sub></font></span><a href="cat_2.html#K12">]</a></span>
 <b>by </b><i><a class="txt" href="nattra_1.html#E4:70"><i><font color="Green">E56</font></i></a>, <a class="txt" href="nattra_1.html#E6:70"><i><font color="Green">E57</font></i></a>, <a class="txt" href="nattra_1.html#E8:70"><i><font color="Green">E58</font></i></a>, <a class="ref" href="funct_3.html#T96">FUNCT_3:96</a></i>;<br/>


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