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<b>let </b><font color="Maroon">C</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">E</font> be    <a href="cat_2.html#M3" target="_self">Subcategory</a> of <font color="Maroon">C</font>;<br/><b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>





<b>assume </b><a NAME="E1:18"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">E</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon">f</font> = <font color="Maroon">x</font> as   <a href="cat_1.html#NM2">Morphism</a> of <font color="Maroon">E</font> ;<br/>
<b>set </b><font color="Maroon">a</font> =  <a href="cat_1.html#K2">dom</a> <font color="Maroon">f</font>;<br/>
<b>set </b><font color="Maroon">b</font> =  <a href="cat_1.html#K3">cod</a> <font color="Maroon">f</font>;<br/>
<b>reconsider </b><font color="Maroon">a'</font> =  <a href="cat_1.html#K2">dom</a> <font color="Maroon">f</font>, <font color="Maroon">b'</font> =  <a href="cat_1.html#K3">cod</a> <font color="Maroon">f</font> as   <a href="cat_1.html#NM1">Object</a> of <font color="Maroon">C</font> <b>by </b><i/>;<br/>
<a NAME="E4:18"/>
( <font color="Maroon">f</font> <a href="hidden.html#R2">in</a>  <a href="cat_1.html#K6">Hom</a> <span class="p1">(<span class="default"><a href="cat_1.html#K2">dom</a> <font color="Maroon">f</font></span>)</span>,<span class="p1">(<span class="default"><a href="cat_1.html#K3">cod</a> <font color="Maroon">f</font></span>)</span> &amp;  <a href="cat_1.html#K6">Hom</a> <span class="p1">(<span class="default"><a href="cat_1.html#K2">dom</a> <font color="Maroon">f</font></span>)</span>,<span class="p1">(<span class="default"><a href="cat_1.html#K3">cod</a> <font color="Maroon">f</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="cat_1.html#K6">Hom</a> <font color="Maroon">a'</font>,<font color="Maroon">b'</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E5:18"/><b>then </b>
<font color="Maroon">f</font> is    <a href="cat_1.html#M1">Morphism</a> of <font color="Maroon">a'</font>,<font color="Maroon">b'</font>
 
<b>by </b><i><a class="ref" href="cat_1.html#T21">CAT_1:21</a></i>;<br/>
<b>hence </b><a NAME="E6:18"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">C</font>
 ;<br/>


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