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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E20">Th17</font></span>: <a NAME="T17"><span class="comment"><font color="firebrick">:: ARYTM_3:17</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">a</font>, <font color="Olive" title="b2">b</font>, <font color="Olive" title="b3">c</font> being   <a href="ordinal1.html#V7" title="ORDINAL1:attr.7">natural</a>  <a href="ordinal1.html#NM3" title="ORDINAL1:NM.3">Ordinal</a> holds  <span class="p1">(<span class="default"><font color="Olive" title="b1">a</font> <a href="ordinal3.html#K9" title="ORDINAL3:func.9">*^</a> <font color="Olive" title="b3">c</font></span>)</span> <a href="arytm_3.html#K3" title="ARYTM_3:func.3">hcf</a> <span class="p1">(<span class="default"><font color="Olive" title="b2">b</font> <a href="ordinal3.html#K9" title="ORDINAL3:func.9">*^</a> <font color="Olive" title="b3">c</font></span>)</span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><font color="Olive" title="b1">a</font> <a href="arytm_3.html#K3" title="ARYTM_3:func.3">hcf</a> <font color="Olive" title="b2">b</font></span>)</span> <a href="ordinal3.html#K9" title="ORDINAL3:func.9">*^</a> <font color="Olive" title="b3">c</font></div></div>
