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<div><span class="kw">theorem </span><a NAME="T7"><span class="comment"><font color="firebrick">:: INT_2:7</font></span><br/></a><div class="add"> <a href="xcmplx_0.html#K4" title="XCMPLX_0:func.4">-</a> 1 is  not    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#NK1" title="NUMBERS:NK.1">NAT</a>  ;<br/></div></div>
