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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">p</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<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">F</font> be    <a href="filter_0.html#M1" target="_self">Filter</a> of <font color="Maroon">L</font>;<br/>







<b>assume </b><a NAME="E1:95"/>
<font color="Maroon">p</font> <a href="filter_0.html#K9" target="_self">&lt;=&gt;</a> <font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F</font>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="filter_0.html#D13" target="_self">FILTER_0:def 13</a><br/>

<b>hence </b><a NAME="E2:95"/>
<font color="Maroon">q</font> <a href="filter_0.html#K9" target="_self">&lt;=&gt;</a> <font color="Maroon">p</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F</font>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="filter_0.html#D13" target="_self">FILTER_0:def 13</a><br/>


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