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<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="struct_0.html#V3">empty</a> <a href="pre_topc.html#NM1">TopSpace</a>;<br/><b>let </b><font color="Maroon">c<sub>2</sub></font> be  <a href="xboole_0.html#V1">empty</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>



<a NAME="E1:32"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="tex_2.html#V3">discrete</a>
 
<b>by </b><i><a class="ref" href="tex_2.html#T35">TEX_2:35</a></i>;<br/>
<b>hence </b><a NAME="E2:32"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="tsp_1.html#V1" target="_self">T_0</a>
 <b>by </b><i><a class="ref" href="tsp_1.html#T11" target="_self">Th11</a></i>;<br/>


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