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<b>consider </b><font color="Maroon">Z</font> being  <a href="xboole_0.html#V1">empty</a> <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font>;<br/>
<a NAME="E2:96_1_1"/>
(  <a href="waybel_0.html#K12" target="_self">fininfs</a> <font color="Maroon">X</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><a href="yellow_0.html#K2">"/\"</a> <font color="Olive">Y</font>,<font color="Maroon">L</font></span>)</span> where <font color="Olive">Y</font> is  <a href="finset_1.html#V1">finite</a> <a href="subset_1.html#NM2">Subset</a> of <font color="Maroon">X</font> :  <a href="yellow_0.html#R2">ex_inf_of</a> <font color="Olive">Y</font>,<font color="Maroon">L</font> </span>}</span>  &amp;  <a href="yellow_0.html#R2">ex_inf_of</a>  <a href="xboole_0.html#K1">{}</a> ,<font color="Maroon">L</font> )
 
<b>by </b><i><a class="ref" href="yellow_0.html#T43">YELLOW_0:43</a></i>;<br/>
<a NAME="E3:96_1_1"/><b>then </b>
 <a href="yellow_0.html#K2">"/\"</a> <font color="Maroon">Z</font>,<font color="Maroon">L</font> <a href="hidden.html#R2">in</a>  <a href="waybel_0.html#K12" target="_self">fininfs</a> <font color="Maroon">X</font>
 
;<br/>
<b>hence </b><a NAME="E4:96_1_1"/>
not  <a href="waybel_0.html#K12" target="_self">fininfs</a> <font color="Maroon">X</font> is <a href="xboole_0.html#V1">empty</a>
 ;<br/>


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