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

<b>let </b><font color="Maroon">S1</font> be   <a href="osalg_1.html#NM3">OrderSortedSign</a>;<br/><b>let </b><font color="Maroon">U0</font> be  <a href="msualg_1.html#V5">non-empty</a> <a href="osalg_1.html#NM5">OSAlgebra</a> of <font color="Maroon">S1</font>;<br/><b>let </b><font color="Maroon">B</font> be    <a href="osalg_2.html#M2" target="_self">OSSubset</a> of <font color="Maroon">U0</font>;<br/>





<b>assume </b><a NAME="E1:85"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">B</font> <a href="pboole.html#R6">=</a> the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">U0</font>
 ;<br/>

<b>set </b><font color="Maroon">L</font> =  <a href="osalg_2.html#K16" target="_self">OSSubAlLattice</a> <font color="Maroon">U0</font>;<br/>
<b>reconsider </b><font color="Maroon">G</font> =  <a href="osalg_2.html#K10" target="_self">GenOSAlg</a> <font color="Maroon">B</font> as    <a href="subset_1.html#M2">Element</a> of  <a href="osalg_2.html#K13" target="_self">OSSub</a> <font color="Maroon">U0</font> <b>by </b><i/>;<br/>
<b>reconsider </b><font color="Maroon">G1</font> = <font color="Maroon">G</font> as   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="osalg_2.html#K16" target="_self">OSSubAlLattice</a> <font color="Maroon">U0</font></span>)</span> ;<br/>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="85_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">(<span class="default"><a href="osalg_2.html#K16" target="_self">OSSubAlLattice</a> <font color="Maroon">U0</font></span>)</span>;<br/><b>reconsider </b><font color="Maroon">a1</font> = <font color="Maroon">a</font> as    <a href="subset_1.html#M2">Element</a> of  <a href="osalg_2.html#K13" target="_self">OSSub</a> <font color="Maroon">U0</font> ;<br/><b>reconsider </b><font color="Maroon">a2</font> = <font color="Maroon">a1</font> as  <a href="msualg_1.html#V4">strict</a> <a href="osalg_2.html#NM3">OSSubAlgebra</a> of <font color="Maroon">U0</font> <b>by </b><i/>;<br/><b>thus </b><font color="Maroon">G1</font> <a href="lattices.html#K3">"\/"</a> <font color="Maroon">a</font> = 
<span class="p1">(<span class="default"><a href="osalg_2.html#K10" target="_self">GenOSAlg</a> <font color="Maroon">B</font></span>)</span> <a href="osalg_2.html#K11" target="_self">"\/"_os</a> <font color="Maroon">a2</font>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">G1</font>
<b>by </b><i>, </i>
;<br/><b>hence </b><a NAME="E4:85_1"/>
<font color="Maroon">a</font> <a href="lattices.html#K3">"\/"</a> <font color="Maroon">G1</font> <a href="hidden.html#R1">=</a> <font color="Maroon">G1</font>
 ;<br/></div><b>end;</b></div>
<b>hence </b><a NAME="E5:85"/>
 <a href="lattices.html#K6">Top</a> <span class="p1">(<span class="default"><a href="osalg_2.html#K16" target="_self">OSSubAlLattice</a> <font color="Maroon">U0</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="osalg_2.html#K10" target="_self">GenOSAlg</a> <font color="Maroon">B</font>
 <b>by </b><i><a class="ref" href="lattices.html#D17">LATTICES:def 17</a></i>;<br/>


</div>
