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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>3</sub></font>, <font color="Maroon">c<sub>4</sub></font> be   <a href="group_1.html#NM1">Group</a>;<br/>

<b>given </b><font color="Maroon">c<sub>5</sub></font> being   <a href="group_6.html#NM2">Homomorphism</a> of <font color="Maroon">c<sub>1</sub></font>,<font color="Maroon">c<sub>3</sub></font><b> such that </b><a NAME="E1:8"/><i><font color="Green">E9</font></i>: 
<font color="Maroon">c<sub>5</sub></font> <a href="group_6.html#NR3" target="_self">is_isomorphism</a> 
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="group_6.html#D15">GROUP_6:def 15</a><br/>

<b>given </b><font color="Maroon">c<sub>6</sub></font> being   <a href="group_6.html#NM2">Homomorphism</a> of <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font><b> such that </b><a NAME="E2:8"/><i><font color="Green">E10</font></i>: 
<font color="Maroon">c<sub>6</sub></font> <a href="group_6.html#NR3" target="_self">is_isomorphism</a> 
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="group_6.html#D15">GROUP_6:def 15</a><br/>

<b>take </b><font color="Maroon">c<sub>7</sub></font> =  <a href="topalg_4.html#K2" target="_self">Gr2Iso</a> <font color="Maroon">c<sub>5</sub></font>,<font color="Maroon">c<sub>6</sub></font>; <i><font color="Red">:: according to </font></i><a class="ref" href="group_6.html#D15">GROUP_6:def 15</a><br/>

<b>thus </b><a NAME="E3:8"/>
<font color="Maroon">c<sub>7</sub></font> is <a href="group_6.html#V4">being_isomorphism</a>
 <b>by </b><i><a class="txt" href="topalg_4.html#E1:8"><i><font color="Green">E9</font></i></a>, <a class="txt" href="topalg_4.html#E2:8"><i><font color="Green">E10</font></i></a>, <a class="ref" href="topalg_4.html#T5" target="_self">Th5</a></i>;<br/>


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