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<b>let </b><font color="Maroon">I</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/><b>let </b><font color="Maroon">X</font> be    <a href="pboole.html#M1" target="_self">ManySortedSet</a> of <font color="Maroon">I</font>;<br/>



<a NAME="E1:134"/>
<font color="Maroon">X</font> <a href="pboole.html#R6" target="_self">=</a> <font color="Maroon">X</font> <a href="pboole.html#K3" target="_self">/\</a> <font color="Maroon">X</font>
 
;<br/>
<b>hence </b><a NAME="E2:134"/>
( <font color="Maroon">X</font> <a href="pboole.html#R4" target="_self">overlaps</a> <font color="Maroon">X</font> implies <font color="Maroon">X</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="pboole.html#K1" target="_self">[0]</a> <font color="Maroon">I</font> )
 <b>by </b><i><a class="ref" href="pboole.html#T16" target="_self">Th16</a></i>;<br/>


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