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<b>let </b><font color="Maroon">L</font> be  non <a href="struct_0.html#V3">empty</a> <a href="waybel_1.html#V11">Boolean</a>  <a href="orders_2.html#L1">RelStr</a> ;<br/>

<a NAME="E1:68"/><i><font color="Green">E11</font></i>: 
<span class="p1">(<span class="default"><a href="yellow_0.html#K3">Bottom</a> <font color="Maroon">L</font></span>)</span> <a href="lattice3.html#K12">"/\"</a> <span class="p1">(<span class="default"><a href="yellow_0.html#K4">Top</a> <font color="Maroon">L</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="yellow_0.html#K3">Bottom</a> <font color="Maroon">L</font>
 
<b>by </b><i><a class="ref" href="waybel_1.html#T4">WAYBEL_1:4</a></i>;<br/>
<a NAME="E2:68"/>
<span class="p1">(<span class="default"><a href="yellow_0.html#K3">Bottom</a> <font color="Maroon">L</font></span>)</span> <a href="lattice3.html#K13">"\/"</a> <span class="p1">(<span class="default"><a href="yellow_0.html#K4">Top</a> <font color="Maroon">L</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="yellow_0.html#K4">Top</a> <font color="Maroon">L</font>
 
<b>by </b><i><a class="ref" href="waybel_1.html#T5">WAYBEL_1:5</a></i>;<br/>
<a NAME="E3:68"/><b>then </b>
 <a href="yellow_0.html#K4">Top</a> <font color="Maroon">L</font> <a href="waybel_1.html#R6">is_a_complement_of</a>  <a href="yellow_0.html#K3">Bottom</a> <font color="Maroon">L</font>
 
<b>by </b><i><a class="ref" href="yellow_5.html#T7" target="_self">Th7</a>, <a class="ref" href="waybel_1.html#D23">WAYBEL_1:def 23</a></i>;<br/>
<b>hence </b><a NAME="E4:68"/>
 <a href="waybel_1.html#K7">'not'</a> <span class="p1">(<span class="default"><a href="yellow_0.html#K3">Bottom</a> <font color="Maroon">L</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="yellow_0.html#K4">Top</a> <font color="Maroon">L</font>
 <b>by </b><i/>;<br/>


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