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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be  <a href="xreal_0.html#V1">real</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>



<b>reconsider </b><font color="Maroon">c<sub>3</sub></font> = <font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>4</sub></font> = <font color="Maroon">c<sub>2</sub></font> as   <a href="real_1.html#NM1">Real</a> <b>by </b><i><a class="ref" href="xreal_0.html#D1">XREAL_0:def 1</a></i>;<br/>
<a NAME="E2:28"/><i><font color="Green">E23</font></i>: 
<span class="p1"><a href="jordan2b.html#K2" target="_self">|[</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>3</sub></font> <a href="real_1.html#K3">+</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span><a href="jordan2b.html#K2" target="_self">]|</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="binarith.html#K13">&lt;*</a><span class="default"><font color="Maroon">c<sub>3</sub></font></span><a href="binarith.html#K13">*&gt;</a></span> <a href="rvsum_1.html#K4">+</a> <span class="p1"><a href="binarith.html#K13">&lt;*</a><span class="default"><font color="Maroon">c<sub>4</sub></font></span><a href="binarith.html#K13">*&gt;</a></span>
 
<b>by </b><i><a class="ref" href="rvsum_1.html#T29">RVSUM_1:29</a></i>;<br/>
<b>thus </b><a NAME="E3:28"/>
<span class="p1"><a href="jordan2b.html#K2" target="_self">|[</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>1</sub></font> <a href="xcmplx_0.html#K2">+</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span><a href="jordan2b.html#K2" target="_self">]|</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="jordan2b.html#K2" target="_self">|[</a><span class="default"><font color="Maroon">c<sub>1</sub></font></span><a href="jordan2b.html#K2" target="_self">]|</a></span> <a href="euclid.html#K17">+</a> <span class="p1"><a href="jordan2b.html#K2" target="_self">|[</a><span class="default"><font color="Maroon">c<sub>2</sub></font></span><a href="jordan2b.html#K2" target="_self">]|</a></span>
 <b>by </b><i><a class="txt" href="jordan2b.html#E2:28"><i><font color="Green">E23</font></i></a>, <a class="ref" href="euclid.html#D10">EUCLID:def 10</a></i>;<br/>


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