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<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#V4">strict</a> <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>reconsider </b><font color="Maroon">B</font> = the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">U0</font> as   <a href="msualg_2.html#NM1">MSSubset</a> of <font color="Maroon">U0</font> <b>by </b><i><a class="ref" href="pboole.html#D23">PBOOLE:def 23</a></i>;<br/>
<a NAME="E2:86"/>
<font color="Maroon">B</font> is   <a href="osalg_1.html#NM4">OrderSortedSet</a> of <font color="Maroon">S1</font>
 
<b>by </b><i><a class="ref" href="osalg_1.html#T17">OSALG_1:17</a></i>;<br/>
<b>then reconsider </b><font color="Maroon">B</font> = the <a href="msualg_1.html#U4">Sorts</a> of <font color="Maroon">U0</font> as    <a href="osalg_2.html#M2" target="_self">OSSubset</a> of <font color="Maroon">U0</font> <b>by </b><i/>;<br/>
<b>thus </b> <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="osalg_2.html#K10" target="_self">GenOSAlg</a> <font color="Maroon">B</font>
<b>by </b><i><a class="ref" href="osalg_2.html#D4" target="_self">Def4</a></i>
<br/>.= 
<font color="Maroon">U0</font>
<b>by </b><i><a class="ref" href="osalg_2.html#T3" target="_self">Th3</a></i>
;<br/>


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