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<div><span class="kw">theorem </span><a NAME="T23"><span class="comment"><font color="firebrick">:: FUNCT_9:23</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">i</font> being   non  <a href="ordinal1.html#V8" title="ORDINAL1:attr.8">zero</a>  <a href="int_1.html#NM1" title="INT_1:NM.1">Integer</a> holds   <a href="fdiff_9.html#K1" title="FDIFF_9:func.1">sec</a>  is <span class="p1">(<span class="default">2 <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <a href="sin_cos.html#K28" title="SIN_COS:func.28">PI</a></span>)</span> <a href="xcmplx_0.html#K3" title="XCMPLX_0:func.3">*</a> <font color="Olive" title="b1">i</font> <a href="funct_9.html#V1" title="FUNCT_9:attr.1">-periodic</a> </div></div>
