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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E18">Th81</font></span>: <a NAME="T81"><span class="comment"><font color="firebrick">:: QUATERN3:81</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">z</font> being   <a href="quaterni.html#NM1" title="QUATERNI:NM.1">Quaternion</a> holds  <font color="Olive" title="b1">z</font> <a href="quatern3.html#K1" title="QUATERN3:func.1">^2</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><a href="quaterni.html#K23" title="QUATERNI:func.23">-</a> <font color="Olive" title="b1">z</font></span>)</span> <a href="quatern3.html#K2" title="QUATERN3:func.2">^2</a> </div></div>
