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<div><span class="kw">theorem </span><a NAME="T16"><span class="comment"><font color="firebrick">:: EXTREAL1:16</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">x</font> being   <a href="xxreal_0.html#NM1" title="XXREAL_0:NM.1">ExtReal</a> holds <br/> ( <font color="Olive" title="b1">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="numbers.html#K5" title="NUMBERS:func.5">0</a>  iff <span class="p1"><a href="extreal1.html#K3" title="EXTREAL1:func.3">|.</a><span class="default"><font color="Olive" title="b1">x</font></span><a href="extreal1.html#K3" title="EXTREAL1:func.3">.|</a></span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="numbers.html#K5" title="NUMBERS:func.5">0</a>  ) <span class="kw">by</span> <span class="lab"><a class="ref" href="extreal1.html#T15" target="_self" onmouseover="rs('extreal1/T15')" onmouseout="rh()">Th4</a>, <a class="ref" href="extreal1.html#D1" target="_self" onmouseover="rs('extreal1/D1')" onmouseout="rh()">Def1</a></span>;<br/></div></div>
