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<div><span class="kw">theorem </span><a NAME="T91"><span class="comment"><font color="firebrick">:: NEWTON05:91</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">a</font> being   <a href="abian.html#V1" title="ABIAN:attr.1">odd</a>  <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a> holds <br/> (  <a href="newton05.html#K3" title="NEWTON05:func.3">Parity</a> <span class="p1">(<span class="default"><font color="Olive" title="b1">a</font> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 2 iff  <a href="newton05.html#K2" title="NEWTON05:func.2">parity</a> <span class="p1">(<span class="default"><font color="Olive" title="b1">a</font> <a href="nat_d.html#K3" title="NAT_D:func.3">div</a> 2</span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="numbers.html#K5" title="NUMBERS:func.5">0</a>  )</div></div>
