<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon" title="c1">G</font> be   <a href="group_1.html#NM1" title="GROUP_1:NM.1">Group</a>;<br/><b>let </b><font color="Maroon" title="c2">N1</font>, <font color="Maroon" title="c3">N2</font> be  <a href="group_3.html#V1" title="GROUP_3:attr.1">normal</a>  <a href="group_2.html#M1" title="GROUP_2:mode.1">Subgroup</a> of <font color="Maroon" title="c1">G</font>;<br/>





<a NAME="E1:75"/>
( <span class="p1"><a href="group_5.html#K8" title="GROUP_5:func.8">[.</a><span class="default"><font color="Maroon" title="c2">N1</font>,<font color="Maroon" title="c3">N2</font></span><a href="group_5.html#K8" title="GROUP_5:func.8">.]</a></span> is    <a href="group_2.html#M1" title="GROUP_2:mode.1">Subgroup</a> of <span class="p1"><a href="group_5.html#K8" title="GROUP_5:func.8">[.</a><span class="default"><font color="Maroon" title="c3">N2</font>,<font color="Maroon" title="c2">N1</font></span><a href="group_5.html#K8" title="GROUP_5:func.8">.]</a></span> &amp; <span class="p1"><a href="group_5.html#K8" title="GROUP_5:func.8">[.</a><span class="default"><font color="Maroon" title="c3">N2</font>,<font color="Maroon" title="c2">N1</font></span><a href="group_5.html#K8" title="GROUP_5:func.8">.]</a></span> is    <a href="group_2.html#M1" title="GROUP_2:mode.1">Subgroup</a> of <span class="p1"><a href="group_5.html#K8" title="GROUP_5:func.8">[.</a><span class="default"><font color="Maroon" title="c2">N1</font>,<font color="Maroon" title="c3">N2</font></span><a href="group_5.html#K8" title="GROUP_5:func.8">.]</a></span> )
 
<b>by </b><i><a class="txt" href="group_5.html#E87"><i><font color="Green" title="E38">Lm2</font></i></a></i>;<br/>
<b>hence </b><a NAME="E2:75"/>
<span class="p1"><a href="group_5.html#K8" title="GROUP_5:func.8">[.</a><span class="default"><font color="Maroon" title="c2">N1</font>,<font color="Maroon" title="c3">N2</font></span><a href="group_5.html#K8" title="GROUP_5:func.8">.]</a></span> <a href="group_2.html#R1" title="GROUP_2:pred.1">=</a> <span class="p1"><a href="group_5.html#K8" title="GROUP_5:func.8">[.</a><span class="default"><font color="Maroon" title="c3">N2</font>,<font color="Maroon" title="c2">N1</font></span><a href="group_5.html#K8" title="GROUP_5:func.8">.]</a></span>
 <b>by </b><i><a class="ref" href="group_2.html#T64" title="GROUP_2:th.64">GROUP_2:64</a></i>;<br/>


</div>
