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<b>let </b><font color="Maroon" title="c7">r</font>, <font color="Maroon" title="c8">s</font> be  <a href="xreal_0.html#V1" title="XREAL_0:attr.1">real</a>  <a href="ordinal1.html#NM1" title="ORDINAL1:NM.1">number</a> ;<br/>



<b>assume </b><a NAME="E1:13"/>
<font color="Maroon" title="c7">r</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> 0
 ;<br/>

<a NAME="E2:13"/><b>then </b>
<font color="Maroon" title="c7">r</font> <a href="xcmplx_0.html#K2" title="XCMPLX_0:func.2">+</a> <font color="Maroon" title="c8">s</font> <a href="xxreal_0.html#NR2" title="XXREAL_0:NR.2">&gt;=</a> 0 <a href="xcmplx_0.html#K2" title="XCMPLX_0:func.2">+</a> <font color="Maroon" title="c8">s</font>
 
<b>by </b><i><a class="txt" href="xreal_0.html#E7"><i><font color="Green" title="E7">Lm6</font></i></a></i>;<br/>
<b>hence </b><a NAME="E3:13"/>
(  not <font color="Maroon" title="c8">s</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a> 0 or <font color="Maroon" title="c7">r</font> <a href="xcmplx_0.html#K2" title="XCMPLX_0:func.2">+</a> <font color="Maroon" title="c8">s</font> <a href="xxreal_0.html#NR4" title="XXREAL_0:NR.4">&gt;</a> 0 )
 <b>by </b><i><a class="txt" href="xreal_0.html#E8"><i><font color="Green" title="E8">Lm7</font></i></a></i>;<br/>


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