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<b>let </b><font color="Maroon" title="c2">P</font> be    <a href="pua2mss1.html#M2" title="PUA2MSS1:mode.2">IndexedPartition</a> of <font color="Maroon" title="c1">X</font>;<br/>

<b>consider </b><font color="Maroon" title="c3">a</font> being    <a href="subset_1.html#M2" title="SUBSET_1:mode.2">Element</a> of  <a href="pua2mss1.html#K3" title="PUA2MSS1:func.3">rng</a> <font color="Maroon" title="c2">P</font>;<br/>
<a NAME="E2:27_1_1"/>
 ex <font color="Olive" title="b1">b</font> being   <a href="hidden.html#M1" title="HIDDEN:mode.1">set</a>  st <span class="p1"><a href="tarski.html#K4" title="TARSKI:func.4">[</a><span class="default"><font color="Olive" title="b1">b</font>,<font color="Maroon" title="c3">a</font></span><a href="tarski.html#K4" title="TARSKI:func.4">]</a></span> <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c2">P</font>
 
<b>by </b><i><a class="ref" href="relat_1.html#D5" title="RELAT_1:def.5">RELAT_1:def 5</a></i>;<br/>
<b>hence </b><a NAME="E3:27_1_1"/>
not <font color="Maroon" title="c2">P</font> is <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>
 ;<br/>


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