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<b>reconsider </b><font color="Maroon">A</font> = <font color="Maroon">C</font>, <font color="Maroon">B</font> = <font color="Maroon">D</font> as   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">T</font> ;<br/>
<a NAME="E2:5_1_1"/><i><font color="Green">E25</font></i>: 
( <font color="Maroon">A</font> is <a href="pre_topc.html#V3">open</a> &amp; <font color="Maroon">B</font> is <a href="pre_topc.html#V3">open</a> )
 
<b>by </b><i/>;<br/>
<a NAME="E3:5_1_1"/>
( <font color="Maroon">A</font> is <a href="pre_topc.html#V4">closed</a> &amp; <font color="Maroon">B</font> is <a href="pre_topc.html#V4">closed</a> )
 
<b>by </b><i/>;<br/>
<a NAME="E4:5_1_1"/><b>then </b>
( <font color="Maroon">A</font> <a href="finsub_1.html#K1">\/</a> <font color="Maroon">B</font> is <a href="pre_topc.html#V3">open</a> &amp; <font color="Maroon">A</font> <a href="finsub_1.html#K1">\/</a> <font color="Maroon">B</font> is <a href="pre_topc.html#V4">closed</a> )
 
<b>by </b><i>, <a class="ref" href="tops_1.html#T36">TOPS_1:36</a>, <a class="ref" href="tops_1.html#T37">TOPS_1:37</a></i>;<br/>
<b>hence </b><a NAME="E5:5_1_1"/>
<font color="Maroon">C</font> <a href="finsub_1.html#K1">\/</a> <font color="Maroon">D</font> is    <a href="subset_1.html#M2">Element</a> of  <a href="lopclset.html#K1" target="_self">OpenClosedSet</a> <font color="Maroon">T</font>
 <b>by </b><i/>;<br/>


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