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<a NAME="E1:50_1_1"/>
the    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of <font color="Maroon" title="c1">A</font> <a href="binop_2.html#K2" title="BINOP_2:func.2">"</a>  <a href="hidden.html#R2" title="HIDDEN:pred.2">in</a> <font color="Maroon" title="c1">A</font> <a href="member_1.html#K7" title="MEMBER_1:func.7">""</a> 
 
<span class="kw">by</span> <span class="lab"><a class="ref" href="member_1.html#T28" target="_self" title="MEMBER_1:th.28">Th28</a></span>;<br/>
<span class="kw">hence </span><a NAME="E2:50_1_1"/>
not <font color="Maroon" title="c1">A</font> <a href="member_1.html#K7" title="MEMBER_1:func.7">""</a>  is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a> 
 ; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="Red">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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