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





<b>assume </b><a NAME="E1:43"/>
<font color="Maroon">a</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">b</font>
 ;<br/>

<b>then </b> <a href="waybel_1.html#K7">'not'</a> <font color="Maroon">a</font> = 
 <a href="waybel_1.html#K7">'not'</a> <span class="p1">(<span class="default"><font color="Maroon">b</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">a</font></span>)</span>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><a href="waybel_1.html#K7">'not'</a> <font color="Maroon">b</font></span>)</span> <a href="lattice3.html#K13">"\/"</a> <span class="p1">(<span class="default"><a href="waybel_1.html#K7">'not'</a> <font color="Maroon">a</font></span>)</span>
<b>by </b><i/>
;<br/>
<b>hence </b><a NAME="E3:43"/>
 <a href="waybel_1.html#K7">'not'</a> <font color="Maroon">b</font> <a href="orders_2.html#R3">&lt;=</a>  <a href="waybel_1.html#K7">'not'</a> <font color="Maroon">a</font>
 <b>by </b><i><a class="ref" href="yellow_0.html#T22">YELLOW_0:22</a></i>;<br/>


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