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<b>let </b><font color="Maroon">A</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">B</font> be   <a href="cat_1.html#NM4">Category</a>;<br/><b>let </b><font color="Maroon">F</font> be    <a href="cat_1.html#M2">Functor</a> of <font color="Maroon">A</font>,<font color="Maroon">B</font>;<br/>





<b>assume </b><a NAME="E1:15"/><i><font color="Green">E18</font></i>: 
<font color="Maroon">F</font> <a href="isocat_1.html#NR1" target="_self">is_an_isomorphism</a> 
 ;<br/>

<a NAME="E2:15"/><b>then </b><i><font color="Green">E19</font></i>: 
<font color="Maroon">F</font> is <a href="funct_1.html#V2">one-to-one</a>
 
<b>by </b><i><a class="ref" href="cat_1.html#D22">CAT_1:def 22</a></i>;<br/>
<a NAME="E3:15"/><i><font color="Green">E22</font></i>: 
<font color="Maroon">F</font> <a href="isocat_1.html#K1" target="_self">"</a>  <a href="isocat_1.html#NR1" target="_self">is_an_isomorphism</a> 
 
<b>by </b><i>, </i>;<br/>
<b>reconsider </b><font color="Maroon">f</font> = <font color="Maroon">F</font> as   <a href="funct_2.html#NM1">Function</a> of the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">A</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font> ;<br/>
<b>reconsider </b><font color="Maroon">g</font> = <font color="Maroon">F</font> <a href="isocat_1.html#K1" target="_self">"</a>  as   <a href="funct_2.html#NM1">Function</a> of the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">B</font>,the <a href="cat_1.html#U2">Morphisms</a> of <font color="Maroon">A</font> ;<br/>
<b>thus </b><span class="p1">(<span class="default"><font color="Maroon">F</font> <a href="isocat_1.html#K1" target="_self">"</a> </span>)</span> <a href="isocat_1.html#K1" target="_self">"</a>  = 
<font color="Maroon">g</font> <a href="funct_1.html#K2">"</a> 
<b>by </b><i>, </i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">f</font> <a href="funct_1.html#K2">"</a> </span>)</span> <a href="funct_1.html#K2">"</a> 
<b>by </b><i>, </i>
<br/>.= 
<font color="Maroon">F</font>
<b>by </b><i>, <a class="ref" href="funct_1.html#T65">FUNCT_1:65</a></i>
;<br/>


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