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( <font color="Maroon">c<sub>8</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0 &amp; <font color="Maroon">c<sub>9</sub></font> <a href="xxreal_0.html#NR2" target="_self">&gt;=</a> 0 )
 
<b>by </b><i><a class="ref" href="xxreal_0.html#D6">XXREAL_0:def 6</a>, <a class="ref" href="xxreal_0.html#D7">XXREAL_0:def 7</a></i>;<br/>
<b>hence </b><a NAME="E2:24_1_1"/>
<font color="Maroon">c<sub>8</sub></font> <a href="xcmplx_0.html#K2">+</a> <font color="Maroon">c<sub>9</sub></font> <a href="xxreal_0.html#NR4" target="_self">&gt;</a> 0
 <b>by </b><i><a class="txt" href="xreal_0.html#E24"><i><font color="Green">Lemma19</font></i></a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="xxreal_0.html#D6">XXREAL_0:def 6</a><br/>


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