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

<a NAME="E1:101"/>
( <span class="p1"><a href="complex1.html#K17" target="_self">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17" target="_self">.|</a></span> <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> or <span class="p1"><a href="complex1.html#K17" target="_self">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17" target="_self">.|</a></span> <a href="hidden.html#R1">=</a>  <a href="xcmplx_0.html#K4">-</a> <font color="Maroon">a</font> )
 
<b>by </b><i><a class="txt" href="complex1.html#E39"><i><font color="Green">Lemma69</font></i></a></i>;<br/>
<b>hence </b><a NAME="E2:101"/>
<span class="p1"><a href="complex1.html#K17" target="_self">|.</a><span class="default"><font color="Maroon">a</font></span><a href="complex1.html#K17" target="_self">.|</a></span> <a href="square_1.html#K5">^2</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">a</font> <a href="square_1.html#K3">^2</a> 
 ;<br/>


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