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<b>let </b><font color="Maroon">S</font> be   <a href="osalg_1.html#NM3">OrderSortedSign</a>;<br/><b>let </b><font color="Maroon">A</font> be  <a href="msualg_1.html#V5">non-empty</a> <a href="osalg_1.html#NM5">OSAlgebra</a> of <font color="Maroon">S</font>;<br/>



<div><b>hereby </b>
<div class="add"><b>assume </b><a NAME="E1:76_1"/><i><font color="Green">E24</font></i>: 
<font color="Maroon">A</font> is <a href="osalg_1.html#V13" target="_self">monotone</a>
 ;<br/><b>let </b><font color="Maroon">o1</font> be   <a href="osalg_1.html#NM2">OperSymbol</a> of <font color="Maroon">S</font>;<br/><b>let </b><font color="Maroon">o2</font> be   <a href="osalg_1.html#NM2">OperSymbol</a> of <font color="Maroon">S</font>;<br/><b>assume </b><a NAME="E2:76_1"/><i><font color="Green">E40</font></i>: 
<font color="Maroon">o1</font> <a href="osalg_1.html#R6" target="_self">&lt;=</a> <font color="Maroon">o2</font>
 ;<br/><a NAME="E3:76_1"/>
<span class="p1">(<span class="default"><a href="msualg_1.html#K5">Den</a> <font color="Maroon">o2</font>,<font color="Maroon">A</font></span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="msualg_1.html#K3">Args</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="msualg_1.html#K5">Den</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font>
 <b>by </b><i><a class="ref" href="osalg_1.html#D4" target="_self">Def4</a>, <a class="ref" href="osalg_1.html#D5" target="_self">Def5</a>, </i>;<br/><b>hence </b><a NAME="E4:76_1"/>
 <a href="msualg_1.html#K5">Den</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font> <a href="tarski.html#R1">c=</a>  <a href="msualg_1.html#K5">Den</a> <font color="Maroon">o2</font>,<font color="Maroon">A</font>
 <b>by </b><i><a class="ref" href="relat_1.html#T88">RELAT_1:88</a></i>;<br/></div>
<b>end;</b></div>

<b>assume </b><a NAME="E2:76"/><i><font color="Green">E50</font></i>: 
for <font color="Olive">o1</font>, <font color="Olive">o2</font> being  <a href="osalg_1.html#NM2">OperSymbol</a> of <font color="Maroon">S</font>  st <font color="Olive">o1</font> <a href="osalg_1.html#R6" target="_self">&lt;=</a> <font color="Olive">o2</font> holds <br/> <a href="msualg_1.html#K5">Den</a> <font color="Olive">o1</font>,<font color="Maroon">A</font> <a href="tarski.html#R1">c=</a>  <a href="msualg_1.html#K5">Den</a> <font color="Olive">o2</font>,<font color="Maroon">A</font>
 ;<br/>

<b>let </b><font color="Maroon">o1</font> be   <a href="osalg_1.html#NM2">OperSymbol</a> of <font color="Maroon">S</font>; <i><font color="Red">:: according to </font></i><a class="ref" href="osalg_1.html#D23" target="_self">OSALG_1:def 23</a><br/><b>let </b><font color="Maroon">o2</font> be   <a href="osalg_1.html#NM2">OperSymbol</a> of <font color="Maroon">S</font>;<br/>



<b>assume </b><a NAME="E3:76"/><i><font color="Green">E53</font></i>: 
<font color="Maroon">o1</font> <a href="osalg_1.html#R6" target="_self">&lt;=</a> <font color="Maroon">o2</font>
 ;<br/>

<a NAME="E4:76"/><i><font color="Green">E56</font></i>: 
 <a href="msualg_1.html#K5">Den</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font> <a href="tarski.html#R1">c=</a>  <a href="msualg_1.html#K5">Den</a> <font color="Maroon">o2</font>,<font color="Maroon">A</font>
 
<b>by </b><i><a class="ref" href="osalg_1.html#D4" target="_self">Def4</a>, <a class="ref" href="osalg_1.html#D5" target="_self">Def5</a></i>;<br/>
<a NAME="E5:76"/><i><font color="Green">E87</font></i>: 
(  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><a href="msualg_1.html#K5">Den</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="msualg_1.html#K3">Args</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font> &amp;  <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><a href="msualg_1.html#K5">Den</a> <font color="Maroon">o2</font>,<font color="Maroon">A</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="msualg_1.html#K3">Args</a> <font color="Maroon">o2</font>,<font color="Maroon">A</font> )
 
<b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<b>hence </b><span class="p1">(<span class="default"><a href="msualg_1.html#K5">Den</a> <font color="Maroon">o2</font>,<font color="Maroon">A</font></span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="msualg_1.html#K3">Args</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font></span>)</span> = 
<span class="p1">(<span class="default"><a href="msualg_1.html#K5">Den</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font></span>)</span> <a href="partfun1.html#K2">|</a> <span class="p1">(<span class="default"><a href="msualg_1.html#K3">Args</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font></span>)</span>
<b>by </b><i><a class="ref" href="osalg_1.html#T3" target="_self">Th3</a>, <a class="ref" href="wellfnd1.html#T1">WELLFND1:1</a></i>
<br/>.= 
 <a href="msualg_1.html#K5">Den</a> <font color="Maroon">o1</font>,<font color="Maroon">A</font>
<b>by </b><i>, <a class="ref" href="relat_1.html#T98">RELAT_1:98</a></i>
;<br/><br/>


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