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<span class="kw">let </span><font color="Maroon" title="c1">G</font> be   <a href="topgrp_1.html#V3" title="TOPGRP_1:attr.3">UnContinuous</a>  <a href="topgrp_1.html#NM4" title="TOPGRP_1:NM.4">TopGroup</a>; <a class="txt" onmouseover="tooltip.show('hs',this)" onmouseout="tooltip.hide()" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide">  for <font color="Olive" title="b1">O</font> being   <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a>  <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">G</font> holds  <font color="Olive" title="b1">O</font> <a href="group_2.html#K1" title="GROUP_2:func.1">"</a>  is  <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a> </span><br/><span class="kw">let </span><font color="Maroon" title="c2">O</font> be   <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a>  <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">G</font>; <a class="txt" onmouseover="tooltip.show('hs',this)" onmouseout="tooltip.hide()" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> <font color="Maroon" title="c2">O</font> <a href="group_2.html#K1" title="GROUP_2:func.1">"</a>  is  <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a> </span><br/>



<a NAME="E1:93"/>
<font color="Maroon" title="c2">O</font> <a href="group_2.html#K1" title="GROUP_2:func.1">"</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><a href="topgrp_1.html#K8" title="TOPGRP_1:func.8">inverse_op</a> <font color="Maroon" title="c1">G</font></span>)</span> <a href="relset_1.html#K7" title="RELSET_1:func.7">.:</a> <font color="Maroon" title="c2">O</font>
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="topgrp_1.html#T10" target="_self" onmouseover="rs('topgrp_1/T10')" onmouseout="rh()">Th9</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:93"/>
<font color="Maroon" title="c2">O</font> <a href="group_2.html#K1" title="GROUP_2:func.1">"</a>  is  <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="topgrp_1.html#T25" target="_self" onmouseover="rs('topgrp_1/T25')" onmouseout="rh()">Th24</a></span>; <a class="txt" onmouseover="tooltip.show('hs',this)" onmouseout="tooltip.hide()" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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