<?xml version="1.0"?>
<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E9">Th9</font></span>: <a NAME="T9"><span class="comment"><font color="firebrick">:: QUATERN2:9</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">c</font> being   <a href="quaterni.html#NM1" title="QUATERNI:NM.1">Quaternion</a><br/>  for <font color="Olive" title="b2">x1</font> being   <a href="xreal_0.html#NM1" title="XREAL_0:NM.1">Real</a> holds  <span class="p1">(<span class="default"><a href="xcmplx_0.html#K4" title="XCMPLX_0:func.4">-</a> <font color="Olive" title="b2">x1</font></span>)</span> <a href="quaterni.html#K20" title="QUATERNI:func.20">*</a> <font color="Olive" title="b1">c</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="quaterni.html#K23" title="QUATERNI:func.23">-</a> <span class="p1">(<span class="default"><font color="Olive" title="b2">x1</font> <a href="quaterni.html#K20" title="QUATERNI:func.20">*</a> <font color="Olive" title="b1">c</font></span>)</span></div></div>
