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<b>thus </b><a NAME="E1:64_1_1"/>
 <a href="pre_topc.html#K2">[#]</a> <span class="p1">(<span class="default"><a href="topalg_2.html#K3">R^1</a>  <a href="pre_topc.html#K3">|</a> <font color="Maroon">c<sub>1</sub></font></span>)</span> is  <a href="topalg_2.html#V2">convex</a> <a href="struct_0.html#NM2">Subset</a> of <a href="topalg_2.html#K3">R^1</a> 
 <b>by </b><i><a class="ref" href="pre_topc.html#D10">PRE_TOPC:def 10</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="topalg_2.html#D4">TOPALG_2:def 4</a><br/>


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