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<b>let </b><font color="Maroon">L</font> be   <a href="lattices.html#NM1">Lattice</a>;<br/>

<b>assume </b><a NAME="E1:52"/>
<font color="Maroon">L</font> is <a href="lattices.html#V14">upper-bounded</a>
 ;<br/>

<a NAME="E2:52"/><b>then </b><i><font color="Green">E14</font></i>: 
( <font color="Maroon">L</font> <a href="lattice2.html#K1">.:</a>  is <a href="lattices.html#V13">lower-bounded</a> &amp; <font color="Maroon">H<sub>1</sub></font>(<font color="Maroon">L</font>) <a href="hidden.html#R1">=</a> <font color="Maroon">H<sub>1</sub></font>(<font color="Maroon">L</font> <a href="lattice2.html#K1">.:</a> ) )
 
<b>by </b><i><a class="ref" href="lattice2.html#T64">LATTICE2:64</a></i>;<br/>
<b>let </b><font color="Maroon">I</font> be    <a href="filter_2.html#M2" target="_self">Ideal</a> of <font color="Maroon">L</font>;<br/>

<b>assume </b><a NAME="E3:52"/>
<font color="Maroon">I</font> <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">H<sub>1</sub></font>(<font color="Maroon">L</font>)
 ;<br/>

<a NAME="E4:52"/><b>then </b>
<font color="Maroon">I</font> <a href="filter_2.html#K15" target="_self">.:</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a> <font color="Maroon">H<sub>1</sub></font>(<font color="Maroon">L</font> <a href="lattice2.html#K1">.:</a> )
 
;<br/>
<b>then consider </b><font color="Maroon">F</font> being    <a href="filter_2.html#M1" target="_self">Filter</a> of <font color="Maroon">L</font> <a href="lattice2.html#K1">.:</a> <b> such that </b><br/><a NAME="E6:52"/><i><font color="Green">E15</font></i>: 
( <font color="Maroon">I</font> <a href="filter_2.html#K15" target="_self">.:</a>  <a href="tarski.html#R1">c=</a> <font color="Maroon">F</font> &amp; <font color="Maroon">F</font> <a href="filter_0.html#NR1" target="_self">is_ultrafilter</a>  )
 <b>by </b><i>, <a class="ref" href="filter_0.html#T22">FILTER_0:22</a></i>;<br/>
<b>take </b>
 <a href="filter_2.html#K14" target="_self">.:</a> <font color="Maroon">F</font>
;<br/>

<a NAME="E7:52"/>
(  <a href="filter_2.html#K14" target="_self">.:</a> <font color="Maroon">F</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F</font> &amp; <span class="p1">(<span class="default"><a href="filter_2.html#K14" target="_self">.:</a> <font color="Maroon">F</font></span>)</span> <a href="filter_2.html#K15" target="_self">.:</a>  <a href="hidden.html#R1">=</a>  <a href="filter_2.html#K14" target="_self">.:</a> <font color="Maroon">F</font> &amp; <font color="Maroon">I</font> <a href="filter_2.html#K15" target="_self">.:</a>  <a href="hidden.html#R1">=</a> <font color="Maroon">I</font> )
 
;<br/>
<b>hence </b><a NAME="E8:52"/>
( <font color="Maroon">I</font> <a href="tarski.html#R1">c=</a>  <a href="filter_2.html#K14" target="_self">.:</a> <font color="Maroon">F</font> &amp;  <a href="filter_2.html#K14" target="_self">.:</a> <font color="Maroon">F</font> <a href="filter_2.html#R2" target="_self">is_max-ideal</a>  )
 <b>by </b><i>, </i>;<br/>


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