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<div><span class="kw">theorem </span><a NAME="T18"><span class="comment"><font color="firebrick">:: FINANCE5:18</font></span><br/></a><div class="add"><span class="p1"><a href="tarski.html#K1" title="TARSKI:func.1">{</a><span class="default"><a href="xxreal_0.html#K2" title="XXREAL_0:func.2">-infty</a></span><a href="tarski.html#K1" title="TARSKI:func.1">}</a></span> is    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="finance5.html#K9" title="FINANCE5:func.9">Ext_Borel_Sets</a>  <span class="kw">by</span> <span class="lab"><a class="ref" href="finance5.html#T16" target="_self" onmouseover="rs('finance5/T16')" onmouseout="rh()">Th500</a>, <a class="ref" href="finance5.html#T17" target="_self" onmouseover="rs('finance5/T17')" onmouseout="rh()">Th600</a></span>;<br/></div></div>
