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<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">V</font>] <b>means </b>( <font color="Maroon">a<sub>1</sub></font> is <a href="convex1.html#V1" target="_self">convex</a> &amp; <font color="Maroon">M</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">a<sub>1</sub></font> );<br/>
<b>thus </b><a NAME="E1:47_1_1"/>
 ex <font color="Olive">F</font> being  <a href="struct_0.html#NM3">Subset-Family</a> of <font color="Maroon">V</font> st <br/>for <font color="Olive">N</font> being  <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">V</font> holds <br/> ( <font color="Olive">N</font> <a href="hidden.html#R2">in</a> <font color="Olive">F</font> iff <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">N</font>] )
 <b>from </b><i><a class="ref" href="subset_1.html#S3">SUBSET_1:sch 3</a>();</i><br/>


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