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<b>let </b><font color="Maroon">L1</font> be   <a href="lattices.html#NM1">Lattice</a>;<br/><b>let </b><font color="Maroon">L2</font> be   <a href="lattices.html#NM1">Lattice</a>;<br/>



<b>assume </b><a NAME="E1:62"/><i><font color="Green">E68</font></i>: 
( <font color="Maroon">L1</font> is   <a href="lattices.html#NM4">0_Lattice</a> &amp; <font color="Maroon">L2</font> is   <a href="lattices.html#NM4">0_Lattice</a> )
 ;<br/>

<div><i><font color="Green">E69</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="62_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">a</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1"><a href="filter_1.html#K7" target="_self">[:</a><span class="default"><font color="Maroon">L1</font>,<font color="Maroon">L2</font></span><a href="filter_1.html#K7" target="_self">:]</a></span>;<br/><b>consider </b><font color="Maroon">p1</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L1</font>, <font color="Maroon">p2</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L2</font><b> such that </b><br/><a NAME="E2:62_1"/><i><font color="Green">E76</font></i>: 
<font color="Maroon">a</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><font color="Maroon">p1</font>,<font color="Maroon">p2</font></span><a href="filter_1.html#K9" target="_self">]</a></span>
 <b>by </b><i><a class="ref" href="domain_1.html#T9">DOMAIN_1:9</a></i>;<br/><b>thus </b><span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L1</font></span>)</span>,<span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L2</font></span>)</span></span><a href="filter_1.html#K9" target="_self">]</a></span> <a href="lattices.html#K4">"/\"</a> <font color="Maroon">a</font> = 
<span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L1</font></span>)</span> <a href="lattices.html#K4">"/\"</a> <font color="Maroon">p1</font></span>)</span>,<span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L2</font></span>)</span> <a href="lattices.html#K4">"/\"</a> <font color="Maroon">p2</font></span>)</span></span><a href="filter_1.html#K9" target="_self">]</a></span>
<b>by </b><i>, </i>
<br/>.= 
<span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L1</font></span>)</span>,<span class="p2">(<span class="default"><span class="p3">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L2</font></span>)</span> <a href="lattices.html#K4">"/\"</a> <font color="Maroon">p2</font></span>)</span></span><a href="filter_1.html#K9" target="_self">]</a></span>
<b>by </b><i>, <a class="ref" href="lattices.html#T40">LATTICES:40</a></i>
<br/>.= 
<span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L1</font></span>)</span>,<span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L2</font></span>)</span></span><a href="filter_1.html#K9" target="_self">]</a></span>
<b>by </b><i>, <a class="ref" href="lattices.html#T40">LATTICES:40</a></i>
;<br/><b>hence </b><a NAME="E4:62_1"/>
<font color="Maroon">a</font> <a href="lattices.html#K4">"/\"</a> <span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L1</font></span>)</span>,<span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L2</font></span>)</span></span><a href="filter_1.html#K9" target="_self">]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L1</font></span>)</span>,<span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L2</font></span>)</span></span><a href="filter_1.html#K9" target="_self">]</a></span>
 ;<br/></div><b>end;</b></div>
<a NAME="E3:62"/>
<span class="p1"><a href="filter_1.html#K7" target="_self">[:</a><span class="default"><font color="Maroon">L1</font>,<font color="Maroon">L2</font></span><a href="filter_1.html#K7" target="_self">:]</a></span> is <a href="lattices.html#V13">lower-bounded</a>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E4:62"/>
 <a href="lattices.html#K5">Bottom</a> <span class="p1"><a href="filter_1.html#K7" target="_self">[:</a><span class="default"><font color="Maroon">L1</font>,<font color="Maroon">L2</font></span><a href="filter_1.html#K7" target="_self">:]</a></span> <a href="hidden.html#R1">=</a> <span class="p1"><a href="filter_1.html#K9" target="_self">[</a><span class="default"><span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L1</font></span>)</span>,<span class="p2">(<span class="default"><a href="lattices.html#K5">Bottom</a> <font color="Maroon">L2</font></span>)</span></span><a href="filter_1.html#K9" target="_self">]</a></span>
 <b>by </b><i>, <a class="ref" href="lattices.html#D16">LATTICES:def 16</a></i>;<br/>


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