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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">H</font> be    <a href="filter_0.html#M1" target="_self">Filter</a> of <font color="Maroon">L</font>;<br/>



<b>assume </b><a NAME="E1:12"/>
<font color="Maroon">L</font> is   <a href="lattices.html#NM5">1_Lattice</a>
 ;<br/>

<b>then reconsider </b><font color="Maroon">L</font> = <font color="Maroon">L</font> as   <a href="lattices.html#NM5">1_Lattice</a> ;<br/>
<b>consider </b><font color="Maroon">p</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E4:12"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a> <font color="Maroon">H</font>
 <b>by </b><i/>;<br/>
<a NAME="E5:12"/>
<font color="Maroon">p</font> <a href="lattices.html#R3">[=</a>  <a href="lattices.html#K6">Top</a> <font color="Maroon">L</font>
 
<b>by </b><i><a class="ref" href="lattices.html#T45">LATTICES:45</a></i>;<br/>
<b>hence </b><a NAME="E6:12"/>
 <a href="lattices.html#K6">Top</a> <font color="Maroon">L</font> <a href="hidden.html#R2">in</a> <font color="Maroon">H</font>
 <b>by </b><i>, </i>;<br/>


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