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<div><span class="kw">theorem </span><a NAME="T10"><span class="comment"><font color="firebrick">:: JORDAN1A:10</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">s</font> being   <a href="xreal_0.html#NM1" title="XREAL_0:NM.1">Real</a><br/>  for <font color="Olive" title="b2">A</font> being   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15" title="EUCLID:func.15">TOP-REAL</a> 2</span>)</span>  st <font color="Olive" title="b2">A</font> <a href="tarski.html#R1" title="TARSKI:pred.1">c=</a>  <a href="jordan6.html#K6" title="JORDAN6:func.6">Vertical_Line</a> <font color="Olive" title="b1">s</font> holds <br/><font color="Olive" title="b2">A</font> is  <a href="sppol_1.html#V2" title="SPPOL_1:attr.2">vertical</a> </div></div>
