<?xml version="1.0"?>
<div class="add">

<b>consider </b><font color="Maroon">a</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E2:37_2_1"/><i><font color="Green">E40</font></i>: 
<font color="Maroon">A</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="openlatt.html#K8" target="_self">StoneH</a> <font color="Maroon">L</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">a</font>
 <b>by </b><i/>;<br/>
<b>consider </b><font color="Maroon">b</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E4:37_2_1"/><i><font color="Green">E41</font></i>: 
<font color="Maroon">B</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="openlatt.html#K8" target="_self">StoneH</a> <font color="Maroon">L</font></span>)</span> <a href="funct_1.html#K1">.</a> <font color="Maroon">b</font>
 <b>by </b><i/>;<br/>
<a NAME="E5:37_2_1"/>
<font color="Maroon">A</font> <a href="xboole_0.html#K3">/\</a> <font color="Maroon">B</font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><a href="openlatt.html#K8" target="_self">StoneH</a> <font color="Maroon">L</font></span>)</span> <a href="funct_1.html#K1">.</a> <span class="p1">(<span class="default"><font color="Maroon">a</font> <a href="lattices.html#K4">"/\"</a> <font color="Maroon">b</font></span>)</span>
 
<b>by </b><i>, <a class="ref" href="openlatt.html#D3" target="_self">Def3</a>, </i>;<br/>
<b>hence </b><a NAME="E6:37_2_1"/>
<font color="Maroon">A</font> <a href="xboole_0.html#K3">/\</a> <font color="Maroon">B</font> is    <a href="subset_1.html#M1">Element</a> of  <a href="openlatt.html#K9" target="_self">StoneS</a> <font color="Maroon">L</font>
 <b>by </b><i/>;<br/>


</div>
