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<b>let </b><font color="Maroon" title="c1">GX</font> be    <a href="pre_topc.html#L1" title="PRE_TOPC:struct.1">TopStruct</a> ;<br/><b>let </b><font color="Maroon" title="c2">R</font> be   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <font color="Maroon" title="c1">GX</font>;<br/>



<b>assume </b><a NAME="E1:100"/>
<font color="Maroon" title="c2">R</font> is <a href="tops_1.html#V5" title="TOPS_1:attr.5">closed_condensed</a>
 ;<br/>

<a NAME="E2:100"/><b>then </b><i><font color="Green" title="E58">A1</font></i>: 
<font color="Maroon" title="c2">R</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <span class="p1">(<span class="default"><a href="tops_1.html#K1" title="TOPS_1:func.1">Int</a> <font color="Maroon" title="c2">R</font></span>)</span>
 
<b>by </b><i><a class="ref" href="tops_1.html#D7" target="_self" title="TOPS_1:def.7">Def7</a></i>;<br/>
<a NAME="E3:100"/><b>then </b>
 <a href="pre_topc.html#K2" title="PRE_TOPC:func.2">Cl</a> <font color="Maroon" title="c2">R</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">R</font>
 
<b>by </b><i><a class="ref" href="tops_1.html#T26" target="_self" title="TOPS_1:th.26">Th26</a></i>;<br/>
<b>hence </b><a NAME="E4:100"/>
 <a href="tops_1.html#K2" title="TOPS_1:func.2">Fr</a> <span class="p1">(<span class="default"><a href="tops_1.html#K1" title="TOPS_1:func.1">Int</a> <font color="Maroon" title="c2">R</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="tops_1.html#K2" title="TOPS_1:func.2">Fr</a> <font color="Maroon" title="c2">R</font>
 <b>by </b><i><a class="txt" href="tops_1.html#E2:100"><i><font color="Green" title="E58">A1</font></i></a>, <a class="ref" href="tops_1.html#T26" target="_self" title="TOPS_1:th.26">Th26</a></i>;<br/>


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