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<b>take </b>
<span class="p1"><a href="quaterni.html#K6" title="QUATERNI:func.6">[*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon" title="c3">x1</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c7">y1</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon" title="c4">x2</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c8">y2</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon" title="c5">x3</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c9">y3</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon" title="c6">x4</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c10">y4</font></span>)</span></span><a href="quaterni.html#K6" title="QUATERNI:func.6">*]</a></span>
;<br/>

<b>thus </b><a NAME="E1:27_1_1"/>
 ex <font color="Olive" title="b1">x1</font>, <font color="Olive" title="b2">x2</font>, <font color="Olive" title="b3">x3</font>, <font color="Olive" title="b4">x4</font>, <font color="Olive" title="b5">y1</font>, <font color="Olive" title="b6">y2</font>, <font color="Olive" title="b7">y3</font>, <font color="Olive" title="b8">y4</font> being   <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K1" title="NUMBERS:func.1">REAL</a>  st <br/>( <font color="Maroon" title="c1">x</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="quaterni.html#K6" title="QUATERNI:func.6">[*</a><span class="default"><font color="Olive" title="b1">x1</font>,<font color="Olive" title="b2">x2</font>,<font color="Olive" title="b3">x3</font>,<font color="Olive" title="b4">x4</font></span><a href="quaterni.html#K6" title="QUATERNI:func.6">*]</a></span> &amp; <font color="Maroon" title="c2">y</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="quaterni.html#K6" title="QUATERNI:func.6">[*</a><span class="default"><font color="Olive" title="b5">y1</font>,<font color="Olive" title="b6">y2</font>,<font color="Olive" title="b7">y3</font>,<font color="Olive" title="b8">y4</font></span><a href="quaterni.html#K6" title="QUATERNI:func.6">*]</a></span> &amp; <span class="p1"><a href="quaterni.html#K6" title="QUATERNI:func.6">[*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon" title="c3">x1</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c7">y1</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon" title="c4">x2</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c8">y2</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon" title="c5">x3</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c9">y3</font></span>)</span>,<span class="p2">(<span class="default"><font color="Maroon" title="c6">x4</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Maroon" title="c10">y4</font></span>)</span></span><a href="quaterni.html#K6" title="QUATERNI:func.6">*]</a></span> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="quaterni.html#K6" title="QUATERNI:func.6">[*</a><span class="default"><span class="p2">(<span class="default"><font color="Olive" title="b1">x1</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Olive" title="b5">y1</font></span>)</span>,<span class="p2">(<span class="default"><font color="Olive" title="b2">x2</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Olive" title="b6">y2</font></span>)</span>,<span class="p2">(<span class="default"><font color="Olive" title="b3">x3</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Olive" title="b7">y3</font></span>)</span>,<span class="p2">(<span class="default"><font color="Olive" title="b4">x4</font> <a href="real_1.html#K3" title="REAL_1:func.3">+</a> <font color="Olive" title="b8">y4</font></span>)</span></span><a href="quaterni.html#K6" title="QUATERNI:func.6">*]</a></span> )
 <b>by </b><i><a class="txt" href="quaterni.html#E3:27"><i><font color="Green" title="E17">A1</font></i></a>, <a class="txt" href="quaterni.html#E6:27"><i><font color="Green" title="E18">A2</font></i></a></i>;<br/>


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