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<b>consider </b><font color="Maroon">c<sub>4</sub></font> being   <a href="mssubfam.html#NM1">MSSubsetFamily</a> of <font color="Maroon">c<sub>2</sub></font><b> such that </b><br/><a NAME="E2:79_1_1"/><i><font color="Green">E32</font></i>: 
( <font color="Maroon">c<sub>4</sub></font> <a href="pboole.html#R6">=</a>  <a href="closure1.html#K6" target="_self">MSFixPoints</a> <font color="Maroon">c<sub>3</sub></font> &amp;  <a href="closure1.html#K7" target="_self">ClOp-&gt;ClSys</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a>  <a href="closure1.html#G1" target="_self">MSClosureStr</a>(# <font color="Maroon">c<sub>2</sub></font>,<font color="Maroon">c<sub>4</sub></font> #) )
 <b>by </b><i><a class="ref" href="closure1.html#D14" target="_self">Def14</a></i>;<br/>
<b>thus </b><a NAME="E3:79_1_1"/>
 <a href="closure1.html#K7" target="_self">ClOp-&gt;ClSys</a> <font color="Maroon">c<sub>3</sub></font> is <a href="msualg_1.html#V5">non-empty</a>
 <b>by </b><i><a class="txt" href="closure1.html#E2:79_1_1"><i><font color="Green">E32</font></i></a></i>;<br/>


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