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<b>take </b><font color="Maroon">c<sub>2</sub></font> = <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><span class="p2">(<span class="default"><a href="rlvect_1.html#K1">0.</a> <font color="Maroon">c<sub>1</sub></font></span>)</span></span><a href="domain_1.html#K6">}</a></span>;<br/>

<b>thus </b><a NAME="E1:37_1_1"/>
not <font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>

<b>thus </b><a NAME="E2:37_1_1"/>
<font color="Maroon">c<sub>2</sub></font> <a href="hidden.html#R1">=</a>  <a href="rltopsp1.html#K2" target="_self">-</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="ref" href="rltopsp1.html#T13" target="_self">Th13</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="rltopsp1.html#D5" target="_self">RLTOPSP1:def 5</a><br/>


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