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<div><span class="kw">theorem </span><a NAME="T56"><span class="comment"><font color="firebrick">:: TOPGEN_1:56</font></span><br/></a><div class="add"> ex <font color="Olive" title="b1">A</font>, <font color="Olive" title="b2">B</font> being   <a href="struct_0.html#NM2" title="STRUCT_0:NM.2">Subset</a> of <a href="topmetr.html#K3" title="TOPMETR:func.3">R^1</a> st <br/>( <font color="Olive" title="b1">A</font> is  <a href="tops_1.html#V2" title="TOPS_1:attr.2">boundary</a>  &amp; <font color="Olive" title="b2">B</font> is  <a href="tops_1.html#V2" title="TOPS_1:attr.2">boundary</a>  &amp;  not <font color="Olive" title="b1">A</font> <a href="subset_1.html#K4" title="SUBSET_1:func.4">\/</a> <font color="Olive" title="b2">B</font> is  <a href="tops_1.html#V2" title="TOPS_1:attr.2">boundary</a>  )</div></div>
