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



<a NAME="E1:67"/>
<span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="lattices.html#K7" target="_self">`</a>  <a href="lattices.html#R2" target="_self">is_a_complement_of</a> <font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> 
 
<b>by </b><i/>;<br/>
<a NAME="E2:67"/><b>then </b><i><font color="Green">E34</font></i>: 
( <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="lattices.html#K3" target="_self">"\/"</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="hidden.html#R1">=</a>  <a href="lattices.html#K6" target="_self">Top</a> <font color="Maroon">L</font> &amp; <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="lattices.html#K4" target="_self">"/\"</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="hidden.html#R1">=</a>  <a href="lattices.html#K5" target="_self">Bottom</a> <font color="Maroon">L</font> )
 
<b>by </b><i/>;<br/>
<a NAME="E3:67"/>
<font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a>  <a href="lattices.html#R2" target="_self">is_a_complement_of</a> <font color="Maroon">a</font>
 
<b>by </b><i/>;<br/>
<a NAME="E4:67"/><b>then </b>
( <font color="Maroon">a</font> <a href="lattices.html#K3" target="_self">"\/"</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="hidden.html#R1">=</a>  <a href="lattices.html#K6" target="_self">Top</a> <font color="Maroon">L</font> &amp; <font color="Maroon">a</font> <a href="lattices.html#K4" target="_self">"/\"</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="hidden.html#R1">=</a>  <a href="lattices.html#K5" target="_self">Bottom</a> <font color="Maroon">L</font> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E5:67"/>
<span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K7" target="_self">`</a> </span>)</span> <a href="lattices.html#K7" target="_self">`</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">a</font>
 <b>by </b><i>, </i>;<br/>


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