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<b>let </b><font color="Maroon">c<sub>2</sub></font> be    <a href="subset_1.html#M1">Element</a> of  <a href="numbers.html#K1">REAL</a> ;<br/>

<a NAME="E1:16_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R2">in</a>  <a href="numbers.html#K1">REAL</a> 
 
;<br/>
<b>hence </b><a NAME="E2:16_1_1"/>
<font color="Maroon">c<sub>2</sub></font> is <a href="xcmplx_0.html#V1" target="_self">complex</a>
 <b>by </b><i><a class="ref" href="xcmplx_0.html#D2" target="_self">Def2</a>, <a class="txt" href="xcmplx_0.html#E15"><i><font color="Green">Lemma10</font></i></a></i>;<br/>


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