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<b>let </b><font color="Maroon">X</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">x</font> be   <a href="pre_topc.html#NM2">Point</a> of <font color="Maroon">X</font>;<br/>



<a NAME="E1:33"/>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">x</font></span><a href="domain_1.html#K6">}</a></span> is <a href="tex_2.html#V3">discrete</a>
 
<b>by </b><i><a class="ref" href="tex_2.html#T36">TEX_2:36</a></i>;<br/>
<b>hence </b><a NAME="E2:33"/>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">x</font></span><a href="domain_1.html#K6">}</a></span> is <a href="tsp_1.html#V1" target="_self">T_0</a>
 <b>by </b><i/>;<br/>


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