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<a NAME="E1:22_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="pre_topc.html#K1">{}</a> <font color="Maroon">c<sub>1</sub></font>
 
;<br/>
<b>hence </b><a NAME="E2:22_1_1"/>
 <a href="convex1.html#K3">conv</a> <font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i><a class="txt" href="rltopsp1.html#E21"><i><font color="Green">Lemma18</font></i></a></i>;<br/>


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