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<b>let </b><font color="Maroon">L</font> be   <a href="lattices.html#NM1">Lattice</a>;<br/><b>let </b><font color="Maroon">q</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/><b>let </b><font color="Maroon">p</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/>





<a NAME="E1:46"/>
( <font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="filter_2.html#K18" target="_self">(.</a><span class="default"><font color="Maroon">p</font></span><a href="filter_2.html#K18" target="_self">.&gt;</a></span> iff  ex <font color="Olive">r</font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> st <br/>( <font color="Maroon">q</font> <a href="hidden.html#R1">=</a> <font color="Olive">r</font> &amp; <font color="Olive">r</font> <a href="lattices.html#R3">[=</a> <font color="Maroon">p</font> ) )
 
;<br/>
<b>hence </b><a NAME="E2:46"/>
( <font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="filter_2.html#K18" target="_self">(.</a><span class="default"><font color="Maroon">p</font></span><a href="filter_2.html#K18" target="_self">.&gt;</a></span> iff <font color="Maroon">q</font> <a href="lattices.html#R3">[=</a> <font color="Maroon">p</font> )
 ;<br/>


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