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<b>consider </b><font color="Maroon">m</font> being    <a href="subset_1.html#M2">Element</a> of  <a href="numbers.html#K5">NAT</a> ;<br/>
<a NAME="E2:18_1_1"/>
 <a href="jordan2c.html#K2">UBD</a> <span class="p1">(<span class="default"><a href="topreal1.html#K5">L~</a> <span class="p2">(<span class="default"><a href="jordan9.html#K1">Cage</a> <font color="Maroon">C</font>,<font color="Maroon">m</font></span>)</span></span>)</span> <a href="hidden.html#R2">in</a>  <a href="jordan10.html#K3" target="_self">UBD-Family</a> <font color="Maroon">C</font>
 
;<br/>
<b>hence </b><a NAME="E3:18_1_1"/>
not  <a href="jordan10.html#K3" target="_self">UBD-Family</a> <font color="Maroon">C</font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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