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<b>let </b><font color="Maroon" title="c1">F</font> be   <a href="grcat_1.html#NM1" title="GRCAT_1:NM.1">GroupMorphism</a>;<br/>

<b>take </b><font color="Maroon" title="c2">G</font> = the <a href="grcat_1.html#U1" title="GRCAT_1:sel.1">Source</a> of <font color="Maroon" title="c1">F</font>;<br/>

<b>take </b><font color="Maroon" title="c3">H</font> = the <a href="grcat_1.html#U2" title="GRCAT_1:sel.2">Target</a> of <font color="Maroon" title="c1">F</font>;<br/>

<a NAME="E1:39"/>
(  <a href="grcat_1.html#K8" title="GRCAT_1:func.8">dom</a> <font color="Maroon" title="c1">F</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">G</font> &amp;  <a href="grcat_1.html#K9" title="GRCAT_1:func.9">cod</a> <font color="Maroon" title="c1">F</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c3">H</font> )
 
;<br/>
<b>hence </b><a NAME="E2:39"/>
<font color="Maroon" title="c1">F</font> is    <a href="grcat_1.html#M1" title="GRCAT_1:mode.1">Morphism</a> of <font color="Maroon" title="c2">G</font>,<font color="Maroon" title="c3">H</font>
 <b>by </b><i><a class="ref" href="grcat_1.html#D19" target="_self" title="GRCAT_1:def.19">Def19</a></i>;<br/>


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