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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E9">Th19</font></span>: <a NAME="T19"><span class="comment"><font color="firebrick">:: REVROT_1:19</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">n</font> being   non  <a href="ordinal1.html#V8" title="ORDINAL1:attr.8">zero</a>  <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a>  holds  <a href="euclid.html#K16" title="EUCLID:func.16">0.REAL</a> <font color="Olive" title="b1">n</font> <a href="hidden.html#NR2" title="HIDDEN:NR.2">&lt;&gt;</a>  <a href="euclid.html#K22" title="EUCLID:func.22">1.REAL</a> <font color="Olive" title="b1">n</font></div></div>
