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

<a NAME="E1:43"/>
<font color="Maroon">H<sub>1</sub></font>(<font color="Maroon">L</font>) is    <a href="filter_2.html#M1" target="_self">Filter</a> of <font color="Maroon">L</font> <a href="lattice2.html#K1">.:</a> 
 
<b>by </b><i><a class="ref" href="filter_0.html#T15">FILTER_0:15</a></i>;<br/>
<b>hence </b><a NAME="E2:43"/>
<font color="Maroon">H<sub>1</sub></font>(<font color="Maroon">L</font>) is    <a href="filter_2.html#M2" target="_self">Ideal</a> of <font color="Maroon">L</font>
 <b>by </b><i/>;<br/>


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