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<b>consider </b><font color="Maroon">F</font> being  <a href="tex_2.html#V1">proper</a> <a href="waybel_0.html#NM4">Filter</a> of <span class="p1">(<span class="default"><a href="yellow_1.html#K3">BoolePoset</a> <font color="Maroon">X</font></span>)</span>;<br/>
<a NAME="E2:42_1_1"/>
 ex <font color="Olive">G</font> being  <a href="waybel_0.html#NM4">Filter</a> of <span class="p1">(<span class="default"><a href="yellow_1.html#K3">BoolePoset</a> <font color="Maroon">X</font></span>)</span> st <br/>( <font color="Maroon">F</font> <a href="tarski.html#R1">c=</a> <font color="Olive">G</font> &amp; <font color="Olive">G</font> is <a href="waybel_7.html#V3" target="_self">ultra</a> )
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:42_1_1"/>
 ex <font color="Olive">b<sub>1</sub></font> being  <a href="waybel_0.html#NM4">Filter</a> of <span class="p1">(<span class="default"><a href="yellow_1.html#K3">BoolePoset</a> <font color="Maroon">X</font></span>)</span> st <font color="Olive">b<sub>1</sub></font> is <a href="waybel_7.html#V3" target="_self">ultra</a>
 ;<br/>


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