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<div><span class="kw">theorem </span><a NAME="T55"><span class="comment"><font color="firebrick">:: NUMBER02:55</font></span><br/></a><div class="add"> not <span class="p1">(<span class="default"><a href="numbers.html#K5" title="NUMBERS:func.5">0</a> <a href="newton.html#K11" title="NEWTON:func.11">|^</a> 4</span>)</span> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="numbers.html#K5" title="NUMBERS:func.5">0</a> <a href="nat_1.html#K1" title="NAT_1:func.1">+</a> 1</span>)</span> <a href="newton.html#K11" title="NEWTON:func.11">|^</a> 4</span>)</span> is  <a href="number02.html#V1" title="NUMBER02:attr.1">composite</a>  ;<br/></div></div>
