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<div><span class="kw">theorem </span><a NAME="T51"><span class="comment"><font color="firebrick">:: NUMBER12:51</font></span><br/></a><div class="add"> <a href="number12.html#K2" title="NUMBER12:func.2">PrimeDivisors</a> 1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="xboole_0.html#K1" title="XBOOLE_0:func.1">{}</a> </div></div>
