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<b>let </b><font color="Maroon">A</font> be   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font>;<br/>

<b>assume </b><a NAME="E1:16_2_1"/>
<font color="Maroon">A</font> is <a href="decomp_1.html#V1">semi-open</a>
 ;<br/>

<a NAME="E2:16_2_1"/><b>then </b>
<font color="Maroon">A</font> <a href="tarski.html#R1">c=</a>  <a href="pre_topc.html#K4">Cl</a> <span class="p1">(<span class="default"><a href="tops_1.html#K1">Int</a> <font color="Maroon">A</font></span>)</span>
 
<b>by </b><i><a class="ref" href="decomp_1.html#D2">DECOMP_1:def 2</a></i>;<br/>
<b>hence </b><a NAME="E3:16_2_1"/>
<font color="Maroon">A</font> is <a href="isomichi.html#V2" target="_self">subcondensed</a>
 <b>by </b><i/>;<br/>


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