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<div><span class="kw">theorem </span><a NAME="T13"><span class="comment"><font color="firebrick">:: TOPGEN_3:13</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">x</font> being   <a href="xreal_0.html#NM1" title="XREAL_0:NM.1">Real</a> holds   <a href="limfunc1.html#NK1" title="LIMFUNC1:NK.1">left_open_halfline</a> <font color="Olive" title="b1">x</font> is   <a href="pre_topc.html#V3" title="PRE_TOPC:attr.3">open</a>  <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <a href="topgen_3.html#K2" title="TOPGEN_3:func.2">Sorgenfrey-line</a></div></div>
