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<b>reconsider </b><font color="Maroon">c<sub>4</sub></font> = <font color="Maroon">c<sub>2</sub></font>, <font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>3</sub></font> as   <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>1</sub></font> ;<br/>
<a NAME="E2:5_2_1"/><i><font color="Green">E4</font></i>: 
( <font color="Maroon">c<sub>4</sub></font> is <a href="pre_topc.html#V3">open</a> &amp; <font color="Maroon">c<sub>5</sub></font> is <a href="pre_topc.html#V3">open</a> )
 
<b>by </b><i><a class="ref" href="lopclset.html#T2" target="_self">Th2</a></i>;<br/>
<a NAME="E3:5_2_1"/>
( <font color="Maroon">c<sub>4</sub></font> is <a href="pre_topc.html#V4">closed</a> &amp; <font color="Maroon">c<sub>5</sub></font> is <a href="pre_topc.html#V4">closed</a> )
 
<b>by </b><i><a class="ref" href="lopclset.html#T3" target="_self">Th3</a></i>;<br/>
<a NAME="E4:5_2_1"/><b>then </b>
( <font color="Maroon">c<sub>4</sub></font> <a href="finsub_1.html#K3">/\</a> <font color="Maroon">c<sub>5</sub></font> is <a href="pre_topc.html#V3">open</a> &amp; <font color="Maroon">c<sub>4</sub></font> <a href="finsub_1.html#K3">/\</a> <font color="Maroon">c<sub>5</sub></font> is <a href="pre_topc.html#V4">closed</a> )
 
<b>by </b><i><a class="txt" href="lopclset.html#E2:5_2_1"><i><font color="Green">E4</font></i></a>, <a class="ref" href="tops_1.html#T35">TOPS_1:35</a>, <a class="ref" href="tops_1.html#T38">TOPS_1:38</a></i>;<br/>
<b>hence </b><a NAME="E5:5_2_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="finsub_1.html#K3">/\</a> <font color="Maroon">c<sub>3</sub></font> is    <a href="subset_1.html#M2">Element</a> of  <a href="lopclset.html#K1" target="_self">OpenClosedSet</a> <font color="Maroon">c<sub>1</sub></font>
 <b>by </b><i><a class="ref" href="lopclset.html#T4" target="_self">Th4</a></i>;<br/>


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