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<div><span class="kw">theorem </span><a NAME="T40"><span class="comment"><font color="firebrick">:: NAT_5:40</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">n0</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="uproots.html#K2" title="UPROOTS:func.2">Sum</a> <span class="p1">(<span class="default"><a href="nat_5.html#K6" title="NAT_5:func.6">Euler_phi</a> <a href="nat_5.html#K1" title="NAT_5:func.1">|</a> <span class="p2">(<span class="default"><a href="moebius1.html#K3" title="MOEBIUS1:func.3">NatDivisors</a> <font color="Olive" title="b1">n0</font></span>)</span></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Olive" title="b1">n0</font></div></div>
