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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E23">Important</font></span>: <a NAME="T32"><span class="comment"><font color="firebrick">:: MOEBIUS3:32</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">n</font> being   non  <a href="zfmisc_1.html#V1" title="ZFMISC_1:attr.1">trivial</a>  <a href="ordinal1.html#NM6" title="ORDINAL1:NM.6">Nat</a>  holds  <a href="series_1.html#K6" title="SERIES_1:func.6">Sum</a> (<a href="basel_1.html#K6" title="BASEL_1:func.6">Basel-seq</a>,<font color="Olive" title="b1">n</font>) <a href="xxreal_0.html#NR3" title="XXREAL_0:NR.3">&lt;</a> 5 <a href="xcmplx_0.html#K7" title="XCMPLX_0:func.7">/</a> 3</div></div>
