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

<b>assume </b><a NAME="E1:19_1_1"/>
<font color="Maroon">a</font> <a href="waybel_1.html#R6">is_a_complement_of</a> <font color="Maroon">b</font>
 ;<br/>

<b>hence </b><a NAME="E2:19_1_1"/>
( <font color="Maroon">a</font> <a href="lattice3.html#K13">"\/"</a> <font color="Maroon">b</font> <a href="hidden.html#R1">=</a>  <a href="yellow_0.html#K4">Top</a> <font color="Maroon">S</font> &amp; <font color="Maroon">a</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">b</font> <a href="hidden.html#R1">=</a>  <a href="yellow_0.html#K3">Bottom</a> <font color="Maroon">S</font> )
 <b>by </b><i><a class="ref" href="waybel_1.html#D23">WAYBEL_1:def 23</a></i>; <i><font color="Red">:: according to </font></i><a class="ref" href="waybel_1.html#D23">WAYBEL_1:def 23</a><br/>


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