<?xml version="1.0"?>
<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E36">Th41</font></span>: <a NAME="T41"><span class="comment"><font color="firebrick">:: MOEBIUS1:41</font></span><br/></a><div class="add"> <a href="moebius1.html#K3" title="MOEBIUS1:func.3">NatDivisors</a> 1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="domain_1.html#K6" title="DOMAIN_1:func.6">{</a><span class="default">1</span><a href="domain_1.html#K6" title="DOMAIN_1:func.6">}</a></span></div></div>
