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<b>let </b><font color="Maroon">L</font> be   <a href="waybel_0.html#NM8">LATTICE</a>;<br/><b>let </b><font color="Maroon">l</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/>



<b>assume </b><a NAME="E1:43"/><i><font color="Green">E46</font></i>: 
<font color="Maroon">l</font> is <a href="waybel_6.html#V5" target="_self">prime</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>, <font color="Maroon">y</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="waybel_6.html#D2" target="_self">WAYBEL_6:def 2</a><br/>

<b>assume </b><a NAME="E2:43"/><i><font color="Green">E47</font></i>: 
<font color="Maroon">l</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">y</font>
 ;<br/>

<a NAME="E3:43"/><b>then </b><i><font color="Green">E48</font></i>: 
( <font color="Maroon">l</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">x</font> &amp; <font color="Maroon">l</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">y</font> )
 
<b>by </b><i><a class="ref" href="yellow_0.html#T23">YELLOW_0:23</a></i>;<br/>
<a NAME="E4:43"/>
<font color="Maroon">x</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">y</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">l</font>
 
<b>by </b><i/>;<br/>
<a NAME="E5:43"/><b>then </b>
( <font color="Maroon">x</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">l</font> or <font color="Maroon">y</font> <a href="orders_2.html#R3">&lt;=</a> <font color="Maroon">l</font> )
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E6:43"/>
( <font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">l</font> or <font color="Maroon">y</font> <a href="hidden.html#R1">=</a> <font color="Maroon">l</font> )
 <b>by </b><i>, <a class="ref" href="orders_2.html#T25">ORDERS_2:25</a></i>;<br/>


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