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<a NAME="E1:31_1_1"/>
( <font color="Maroon">r</font> <a href="xxreal_0.html#R1">&lt;=</a> 0 &amp; <font color="Maroon">s</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="E2:31_1_1"/>
<font color="Maroon">r</font> <a href="xcmplx_0.html#K3">*</a> <font color="Maroon">s</font> <a href="xxreal_0.html#R1">&lt;=</a> 0
 <b>by </b><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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