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<div><span class="kw">theorem </span><span class="lab"><font color="Green" title="E4">Th1</font></span>: <a NAME="T1"><span class="comment"><font color="firebrick">:: QUATERN2:1</font></span><br/></a><div class="add"> for <font color="Olive" title="b1">x</font>, <font color="Olive" title="b2">y</font>, <font color="Olive" title="b3">z</font>, <font color="Olive" title="b4">w</font> being   <a href="xreal_0.html#NM1" title="XREAL_0:NM.1">Real</a> holds  <span class="p1"><a href="quaterni.html#K5" title="QUATERNI:func.5">[*</a><span class="default"><font color="Olive" title="b1">x</font>,<font color="Olive" title="b2">y</font>,<font color="Olive" title="b3">z</font>,<font color="Olive" title="b4">w</font></span><a href="quaterni.html#K5" title="QUATERNI:func.5">*]</a></span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Olive" title="b1">x</font> <a href="quaterni.html#K18" title="QUATERNI:func.18">+</a> <span class="p3">(<span class="default"><font color="Olive" title="b2">y</font> <a href="quaterni.html#K20" title="QUATERNI:func.20">*</a> <a href="complex1.html#K7" title="COMPLEX1:func.7">&lt;i&gt;</a></span>)</span></span>)</span> <a href="quaterni.html#K21" title="QUATERNI:func.21">+</a> <span class="p2">(<span class="default"><font color="Olive" title="b3">z</font> <a href="quaterni.html#K20" title="QUATERNI:func.20">*</a> <a href="quaterni.html#K10" title="QUATERNI:func.10">&lt;j&gt;</a></span>)</span></span>)</span> <a href="quaterni.html#K21" title="QUATERNI:func.21">+</a> <span class="p1">(<span class="default"><font color="Olive" title="b4">w</font> <a href="quaterni.html#K20" title="QUATERNI:func.20">*</a> <a href="quaterni.html#K11" title="QUATERNI:func.11">&lt;k&gt;</a></span>)</span></div></div>
