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<b>consider </b><font color="Maroon">c<sub>2</sub></font> being  <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="E2:12_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="convex3.html#V1" target="_self">cone</a>
 
<b>by </b><i><a class="ref" href="convex3.html#T6" target="_self">Th6</a></i>;<br/>
<b>hence </b><a NAME="E3:12_1_1"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">c<sub>1</sub></font> st <font color="Olive">b<sub>1</sub></font> is <a href="convex3.html#V1" target="_self">cone</a>
 ;<br/>


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