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<b>reconsider </b><font color="Maroon">D'</font> = <font color="Maroon">S</font> as  non <a href="xboole_0.html#V1">empty</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">L</font> ;<br/>
<a NAME="E2:30_1_1"/>
( not <font color="Maroon">D'</font> <a href="filter_2.html#K7" target="_self">.:</a>  is <a href="xboole_0.html#V1">empty</a> &amp; <font color="Maroon">S</font> <a href="filter_2.html#K9" target="_self">.:</a>  is    <a href="lattice4.html#M2">ClosedSubset</a> of <font color="Maroon">L</font> <a href="lattice2.html#K1">.:</a>  )
 
;<br/>
<b>hence </b><a NAME="E3:30_1_1"/>
<font color="Maroon">S</font> <a href="filter_2.html#K7" target="_self">.:</a>  is  non <a href="xboole_0.html#V1">empty</a>  <a href="lattice4.html#M2">ClosedSubset</a> of <font color="Maroon">L</font> <a href="lattice2.html#K1">.:</a> 
 ;<br/>


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