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<a NAME="E1:5_1_1"/>
(  <a href="yellow_0.html#K4">Top</a> <span class="p1">(<span class="default"><a href="yellow_1.html#K3">BoolePoset</a> <font color="Maroon">X</font></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font> &amp;  <a href="yellow_0.html#K3">Bottom</a> <span class="p1">(<span class="default"><a href="yellow_1.html#K3">BoolePoset</a> <font color="Maroon">X</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="xboole_0.html#K1">{}</a>  )
 
<b>by </b><i><a class="ref" href="yellow_1.html#T18">YELLOW_1:18</a>, <a class="ref" href="yellow_1.html#T19">YELLOW_1:19</a></i>;<br/>
<b>hence </b><a NAME="E2:5_1_1"/>
not  <a href="yellow_1.html#K3">BoolePoset</a> <font color="Maroon">X</font> is <a href="realset2.html#V3">trivial</a>
 <b>by </b><i/>;<br/>


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