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( <font color="Maroon" title="c2">X</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  or  not <font color="Maroon" title="c2">X</font> is  <a href="xboole_0.html#V1" title="XBOOLE_0:attr.1">empty</a>  )
 
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<span class="kw">hence </span><a NAME="E2:44_1_1"/>
 for <font color="Olive">b<sub>1</sub></font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of <font color="Maroon" title="c2">X</font> holds  <font color="Olive">b<sub>1</sub></font> is  <a href="valued_0.html#V6" title="VALUED_0:attr.6">natural-valued</a> 
 <span class="kw">by</span> <span class="lab"><a class="ref" href="valued_2.html#D7" target="_self" title="VALUED_2:def.7">Def7</a>, <a class="ref" href="subset_1.html#D1" title="SUBSET_1:def.1">SUBSET_1:def 1</a></span>; <a class="txt" onclick="hs(this)" href="javascript:()"><span class="comment"><font color="firebrick">::  thesis: </font></span></a><span class="hide"> verum</span><br/>


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