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<div><span class="kw">theorem </span><a NAME="T13"><span class="comment"><font color="firebrick">:: EXTREAL1:13</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/>( <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> <font color="Olive" title="b1">x</font> or <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="xxreal_3.html#K2" title="XXREAL_3:func.2">-</a> <font color="Olive" title="b1">x</font> ) <span class="kw">by</span> <span class="lab"><a class="ref" href="extreal1.html#D1" target="_self" onmouseover="rs('extreal1/D1')" onmouseout="rh()">Def1</a></span>;<br/></div></div>
