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<b>let </b><font color="Maroon">L</font> be   <a href="lattices.html#NM8">B_Lattice</a>;<br/><b>let </b><font color="Maroon">X</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/><b>let </b><font color="Maroon">Y</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/>





<a NAME="E1:38"/>
( <font color="Maroon">X</font> <a href="lattices.html#R3">[=</a> <font color="Maroon">X</font> <a href="lattices.html#K3">"\/"</a> <font color="Maroon">Y</font> &amp; <font color="Maroon">X</font> <a href="lattices.html#R3">[=</a> <font color="Maroon">Y</font> <a href="lattices.html#K3">"\/"</a> <font color="Maroon">X</font> )
 
<b>by </b><i><a class="ref" href="lattices.html#T22">LATTICES:22</a></i>;<br/>
<b>hence </b><a NAME="E2:38"/>
<font color="Maroon">X</font> <a href="boolealg.html#K1" target="_self">\</a> <span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="lattices.html#K3">"\/"</a> <font color="Maroon">Y</font></span>)</span> <a href="boolealg.html#R1" target="_self">=</a>  <a href="lattices.html#K5">Bottom</a> <font color="Maroon">L</font>
 <b>by </b><i><a class="txt" href="boolealg.html#E5"><i><font color="Green">Lemma11</font></i></a></i>;<br/>


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