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<b>let </b><font color="Maroon">I</font> be    <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">M</font> be  <a href="relat_1.html#V2">V5</a>  <a href="pboole.html#M1">ManySortedSet</a> of <font color="Maroon">I</font>;<br/><b>let </b><font color="Maroon">X</font> be    <a href="pboole.html#M2">Element</a> of <font color="Maroon">M</font>, <font color="Maroon">Y</font> be    <a href="pboole.html#M2">Element</a> of <font color="Maroon">M</font>;<br/>





<b>set </b><font color="Maroon">F</font> =  <a href="msualg_3.html#K2">id</a> <font color="Maroon">M</font>;<br/>
<b>assume </b><a NAME="E1:18"/>
<font color="Maroon">X</font> <a href="pboole.html#K2">\/</a> <font color="Maroon">Y</font> is    <a href="pboole.html#M2">Element</a> of <font color="Maroon">M</font>
 ;<br/>

<b>hence </b><span class="p1">(<span class="default"><a href="msualg_3.html#K2">id</a> <font color="Maroon">M</font></span>)</span> <a href="closure1.html#K1" target="_self">..</a> <span class="p1">(<span class="default"><font color="Maroon">X</font> <a href="pboole.html#K2">\/</a> <font color="Maroon">Y</font></span>)</span> = 
<font color="Maroon">X</font> <a href="pboole.html#K2">\/</a> <font color="Maroon">Y</font>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="msualg_3.html#K2">id</a> <font color="Maroon">M</font></span>)</span> <a href="closure1.html#K2" target="_self">..</a> <font color="Maroon">X</font></span>)</span> <a href="pboole.html#K2">\/</a> <font color="Maroon">Y</font>
<b>by </b><i/>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="msualg_3.html#K2">id</a> <font color="Maroon">M</font></span>)</span> <a href="closure1.html#K2" target="_self">..</a> <font color="Maroon">X</font></span>)</span> <a href="pboole.html#K2">\/</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="msualg_3.html#K2">id</a> <font color="Maroon">M</font></span>)</span> <a href="closure1.html#K2" target="_self">..</a> <font color="Maroon">Y</font></span>)</span>
<b>by </b><i/>
;<br/><br/>


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