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<b>let </b><font color="Maroon">x</font> be   <a href="struct_0.html#NM1">Element</a> of <span class="p1">(<span class="default"><a href="yellow_1.html#K2">InclPoset</a> <span class="p2">(<span class="default"><a href="waybel_0.html#K8">Filt</a> <font color="Maroon">L</font></span>)</span></span>)</span>;<br/>

<a NAME="E1:10_1_1"/>
 <a href="yellow_1.html#K2">InclPoset</a> <span class="p1">(<span class="default"><a href="waybel_0.html#K8">Filt</a> <font color="Maroon">L</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="orders_2.html#G1">RelStr</a>(# <span class="p1">(<span class="default"><a href="waybel_0.html#K8">Filt</a> <font color="Maroon">L</font></span>)</span>,<span class="p1">(<span class="default"><a href="yellow_1.html#K1">RelIncl</a> <span class="p2">(<span class="default"><a href="waybel_0.html#K8">Filt</a> <font color="Maroon">L</font></span>)</span></span>)</span> #)
 
<b>by </b><i><a class="ref" href="yellow_1.html#D1">YELLOW_1:def 1</a></i>;<br/>
<a NAME="E2:10_1_1"/><b>then </b>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="waybel_0.html#K8">Filt</a> <font color="Maroon">L</font>
 
;<br/>
<a NAME="E3:10_1_1"/><b>then </b>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">X</font> where <font color="Olive">X</font> is   <a href="waybel_0.html#NM4">Filter</a> of <font color="Maroon">L</font> : verum </span>}</span> 
 
;<br/>
<b>then consider </b><font color="Maroon">X</font> being   <a href="waybel_0.html#NM4">Filter</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E5:10_1_1"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">x</font> <a href="hidden.html#R1">=</a> <font color="Maroon">X</font>
 ;<br/>
<b>thus </b><a NAME="E6:10_1_1"/>
not <font color="Maroon">x</font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i/>;<br/>


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