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

<b>take </b><font color="Maroon">c<sub>2</sub></font> =  <a href="xcmplx_0.html#K4">-</a> <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>thus </b><a NAME="E1:2"/>
<font color="Maroon">c<sub>1</sub></font> <a href="xcmplx_0.html#K2">+</a> <font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a> 0
 ;<br/>


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