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<b>let </b><font color="Maroon" title="c1">TS</font> be   <a href="pre_topc.html#NM1" title="PRE_TOPC:NM.1">TopSpace</a>;<br/><b>let </b><font color="Maroon" title="c2">P</font>, <font color="Maroon" title="c3">Q</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">TS</font>;<br/>





<b>assume </b><b>that </b><br/><a NAME="E1:72"/><i><font color="Green" title="E48">A1</font></i>: 
<font color="Maroon" title="c2">P</font> is <a href="tops_1.html#V1" title="TOPS_1:attr.1">dense</a>
 <b>and </b><br/><a NAME="E2:72"/><i><font color="Green" title="E49">A2</font></i>: 
 <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c3">Q</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="struct_0.html#K2" title="STRUCT_0:func.2">[#]</a> <font color="Maroon" title="c1">TS</font>
 <b>and </b><br/><a NAME="E3:72"/><i><font color="Green" title="E50">A3</font></i>: 
<font color="Maroon" title="c3">Q</font> is <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="tops_1.html#D3" target="_self" title="TOPS_1:def.3">TOPS_1:def 3</a><br/>

<b>thus </b><a NAME="E4:72"/>
 <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">P</font> <a href="subset_1.html#K9" title="SUBSET_1:func.9">/\</a> <font color="Maroon" title="c3">Q</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="struct_0.html#K2" title="STRUCT_0:func.2">[#]</a> <font color="Maroon" title="c1">TS</font>
 <b>by </b><i><a class="txt" href="tops_1.html#E1:72"><i><font color="Green" title="E48">A1</font></i></a>, <a class="txt" href="tops_1.html#E3:72"><i><font color="Green" title="E50">A3</font></i></a>, <a class="ref" href="tops_1.html#T81" target="_self" title="TOPS_1:th.81">Th81</a>, <a class="txt" href="tops_1.html#E2:72"><i><font color="Green" title="E49">A2</font></i></a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="tops_1.html#D3" target="_self" title="TOPS_1:def.3">TOPS_1:def 3</a><br/>


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