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<b>let </b><font color="Maroon">X</font> be   <a href="pre_topc.html#NM1">TopSpace</a>;<br/>

<a NAME="E1:22"/><i><font color="Green">E30</font></i>: 
 <a href="pre_topc.html#K1">{}</a> <font color="Maroon">X</font> <a href="hidden.html#R1">=</a>  <a href="pre_topc.html#K4">Cl</a> <span class="p1">(<span class="default"><a href="pre_topc.html#K1">{}</a> <font color="Maroon">X</font></span>)</span>
 
<b>by </b><i><a class="ref" href="pcomps_1.html#T2">PCOMPS_1:2</a></i>;<br/>
<a NAME="E2:22"/>
 <a href="pre_topc.html#K1">{}</a> <font color="Maroon">X</font> <a href="hidden.html#R1">=</a>  <a href="tops_1.html#K1">Int</a> <span class="p1">(<span class="default"><a href="pre_topc.html#K1">{}</a> <font color="Maroon">X</font></span>)</span>
 
;<br/>
<b>hence </b><a NAME="E3:22"/>
(  <a href="pre_topc.html#K1">{}</a> <font color="Maroon">X</font> is <a href="tops_1.html#V6">regular_open</a> &amp;  <a href="pre_topc.html#K1">{}</a> <font color="Maroon">X</font> is <a href="tops_1.html#V5">regular_closed</a> )
 <b>by </b><i><a class="ref" href="tops_1.html#D8">TOPS_1:def 8</a>, <a class="ref" href="tops_1.html#D7">TOPS_1:def 7</a>, </i>;<br/>


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