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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E252">Th18</font></span>: <a NAME="T353"><span class="comment"><font color="firebrick">:: GROUP_1A:353</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">G</font> being   <a href="group_1a.html#NM1" title="GROUP_1A:NM.1">addGroup</a><br/>  for <font color="Olive" title="b2">a</font> being   <a href="struct_0.html#NM1" title="STRUCT_0:NM.1">Element</a> of <font color="Olive" title="b1">G</font> holds  <span class="p1">(<span class="default"><a href="group_1a.html#K36" title="GROUP_1A:func.36">+</a> <font color="Olive" title="b2">a</font></span>)</span> <a href="tops_2.html#K2" title="TOPS_2:func.2">/"</a>  <a href="funct_2.html#R2" title="FUNCT_2:pred.2">=</a>  <a href="group_1a.html#K36" title="GROUP_1A:func.36">+</a> <span class="p1">(<span class="default"><a href="group_1a.html#K2" title="GROUP_1A:func.2">-</a> <font color="Olive" title="b2">a</font></span>)</span></div></div>
