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<b>let </b><font color="Maroon">I</font> be   <a href="filter_0.html#NM2">I_Lattice</a>;<br/>

<b>consider </b><font color="Maroon">i</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">I</font>;<br/>
<b>take </b><font color="Maroon">k</font> = <font color="Maroon">i</font> <a href="filter_0.html#K4" target="_self">=&gt;</a> <font color="Maroon">i</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="lattices.html#D14">LATTICES:def 14</a><br/>

<b>let </b><font color="Maroon">j</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">I</font>;<br/>

<a NAME="E2:39"/>
<font color="Maroon">i</font> <a href="lattices.html#K4">"/\"</a> <font color="Maroon">j</font> <a href="lattices.html#R3">[=</a> <font color="Maroon">i</font>
 
<b>by </b><i><a class="ref" href="lattices.html#T23">LATTICES:23</a></i>;<br/>
<a NAME="E3:39"/><b>then </b>
( <font color="Maroon">j</font> <a href="lattices.html#R3">[=</a> <font color="Maroon">k</font> &amp; <font color="Maroon">j</font> <a href="lattices.html#K3">"\/"</a> <font color="Maroon">k</font> <a href="hidden.html#R1">=</a> <font color="Maroon">k</font> <a href="lattices.html#K3">"\/"</a> <font color="Maroon">j</font> )
 
<b>by </b><i><a class="ref" href="filter_0.html#T1" target="_self">Th1</a></i>;<br/>
<b>hence </b><a NAME="E4:39"/>
( <font color="Maroon">k</font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">j</font> <a href="hidden.html#R1">=</a> <font color="Maroon">k</font> &amp; <font color="Maroon">j</font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">k</font> <a href="hidden.html#R1">=</a> <font color="Maroon">k</font> )
 <b>by </b><i><a class="ref" href="lattices.html#D3">LATTICES:def 3</a></i>;<br/>


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