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<b>let </b><font color="Maroon">f1</font> be    <a href="cat_1.html#M1">Morphism</a> of <font color="Maroon">a</font>,<font color="Maroon">b</font>, <font color="Maroon">f2</font> be    <a href="cat_1.html#M1">Morphism</a> of <font color="Maroon">a</font>,<font color="Maroon">b</font>;<br/>

<b>consider </b><font color="Maroon">f</font> being    <a href="cat_1.html#M1">Morphism</a> of <font color="Maroon">a</font>,<font color="Maroon">b</font><b> such that </b><br/><a NAME="E2:46_1_1"/><i><font color="Green">E42</font></i>: 
for <font color="Olive">g</font> being   <a href="cat_1.html#M1">Morphism</a> of <font color="Maroon">a</font>,<font color="Maroon">b</font> holds  <font color="Maroon">f</font> <a href="hidden.html#R1">=</a> <font color="Olive">g</font>
 <b>by </b><i>, <a class="ref" href="cat_1.html#D15">CAT_1:def 15</a></i>;<br/>
<b>thus </b><font color="Maroon">f1</font> = 
<font color="Maroon">f</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">f2</font>
<b>by </b><i/>
;<br/>


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