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<b>let </b><font color="Maroon" title="c1">I</font> be    <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a> ;<br/><b>let </b><font color="Maroon" title="c2">M</font> be  <a href="relat_1.html#V2" title="RELAT_1:attr.2">V5</a>  <a href="pboole.html#M1" title="PBOOLE:mode.1">ManySortedSet</a> of <font color="Maroon" title="c1">I</font>;<br/><b>let </b><font color="Maroon" title="c3">X</font>, <font color="Maroon" title="c4">Y</font> be    <a href="pboole.html#M2" title="PBOOLE:mode.2">Element</a> of <font color="Maroon" title="c2">M</font>;<br/>





<b>set </b><font color="Maroon" title="c5">F</font> =  <a href="msualg_3.html#K2" title="MSUALG_3:func.2">id</a> <font color="Maroon" title="c2">M</font>;<br/>
<b>assume </b><a NAME="E1:18"/>
<font color="Maroon" title="c3">X</font> <a href="pboole.html#K2" title="PBOOLE:func.2">\/</a> <font color="Maroon" title="c4">Y</font> is    <a href="pboole.html#M2" title="PBOOLE:mode.2">Element</a> of <font color="Maroon" title="c2">M</font>
 ;<br/>

<b>hence </b><span class="p1">(<span class="default"><a href="msualg_3.html#K2" title="MSUALG_3:func.2">id</a> <font color="Maroon" title="c2">M</font></span>)</span> <a href="closure1.html#K1" title="CLOSURE1:func.1">..</a> <span class="p1">(<span class="default"><font color="Maroon" title="c3">X</font> <a href="pboole.html#K2" title="PBOOLE:func.2">\/</a> <font color="Maroon" title="c4">Y</font></span>)</span> = 
<font color="Maroon" title="c3">X</font> <a href="pboole.html#K2" title="PBOOLE:func.2">\/</a> <font color="Maroon" title="c4">Y</font>
<b>by </b><i><a class="ref" href="closure1.html#T8" target="_self" title="CLOSURE1:th.8">Th8</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="msualg_3.html#K2" title="MSUALG_3:func.2">id</a> <font color="Maroon" title="c2">M</font></span>)</span> <a href="closure1.html#K2" title="CLOSURE1:func.2">..</a> <font color="Maroon" title="c3">X</font></span>)</span> <a href="pboole.html#K2" title="PBOOLE:func.2">\/</a> <font color="Maroon" title="c4">Y</font>
<b>by </b><i><a class="ref" href="closure1.html#T8" target="_self" title="CLOSURE1:th.8">Th8</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="msualg_3.html#K2" title="MSUALG_3:func.2">id</a> <font color="Maroon" title="c2">M</font></span>)</span> <a href="closure1.html#K2" title="CLOSURE1:func.2">..</a> <font color="Maroon" title="c3">X</font></span>)</span> <a href="pboole.html#K2" title="PBOOLE:func.2">\/</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="msualg_3.html#K2" title="MSUALG_3:func.2">id</a> <font color="Maroon" title="c2">M</font></span>)</span> <a href="closure1.html#K2" title="CLOSURE1:func.2">..</a> <font color="Maroon" title="c4">Y</font></span>)</span>
<b>by </b><i><a class="ref" href="closure1.html#T8" target="_self" title="CLOSURE1:th.8">Th8</a></i>
;<br/><br/>


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