<?xml version="1.0"?>
<div class="add">

<b>let </b><font color="Maroon">L</font> be  <a href="yellow_0.html#V1">lower-bounded</a> <a href="waybel_3.html#V3">continuous</a> <a href="waybel_0.html#NM8">LATTICE</a>;<br/><b>let </b><font color="Maroon">V</font> be  <a href="waybel_0.html#V13">upper</a> <a href="waybel_6.html#V1">Open</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">L</font>;<br/><b>let </b><font color="Maroon">N</font> be  non <a href="xboole_0.html#V1">empty</a> <a href="card_4.html#V1">countable</a> <a href="struct_0.html#NM2">Subset</a> of <font color="Maroon">L</font>;<br/><b>let </b><font color="Maroon">v</font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>;<br/>







<b>assume </b><b>that </b><br/><a NAME="E1:55"/><i><font color="Green">E25</font></i>: 
<font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">N</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">V</font>
 <b>and </b><br/><a NAME="E2:55"/><i><font color="Green">E26</font></i>: 
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font>
 ;<br/>

<b>reconsider </b><font color="Maroon">G</font> = <span class="p1">{<span class="default"> <font color="Olive">x</font> where <font color="Olive">x</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> : <font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Olive">x</font></span><a href="domain_1.html#K6">}</a></span> <a href="tarski.html#R1">c=</a> <font color="Maroon">V</font> </span>}</span>  as   <a href="waybel_0.html#NM4">Filter</a> of <font color="Maroon">L</font> <b>by </b><i>, , </i>;<br/>
<a NAME="E4:55"/>
<font color="Maroon">N</font> is    <a href="waybel12.html#M1" target="_self">GeneratorSet</a> of  <a href="waybel_0.html#K4">uparrow</a> <span class="p1">(<span class="default"><a href="waybel_0.html#K12">fininfs</a> <font color="Maroon">N</font></span>)</span>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="55_1"><b>proof </b></a><div class="add">

<b>thus </b><a NAME="E1:55_1"/>
 <a href="waybel_0.html#K4">uparrow</a> <span class="p1">(<span class="default"><a href="waybel_0.html#K12">fininfs</a> <font color="Maroon">N</font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="waybel_0.html#K4">uparrow</a> <span class="p1">(<span class="default"><a href="waybel_0.html#K12">fininfs</a> <font color="Maroon">N</font></span>)</span>
 ; <i><font color="Red">:: according to </font></i><a class="ref" href="waybel12.html#D3" target="_self">WAYBEL12:def 3</a><br/>


</div><b>end;</b></div>
<b>then consider </b><font color="Maroon">F</font> being   <a href="waybel_0.html#NM4">Filter</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E6:55"/><i><font color="Green">E28</font></i>: 
<font color="Maroon">N</font> is    <a href="waybel12.html#M1" target="_self">GeneratorSet</a> of <font color="Maroon">F</font>
 ;<br/>
<a NAME="E7:55"/><i><font color="Green">E29</font></i>: 
<font color="Maroon">N</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">G</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="55_2"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">q</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:55_2"/><i><font color="Green">E30</font></i>: 
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">N</font>
 ;<br/>

<b>then reconsider </b><font color="Maroon">q1</font> = <font color="Maroon">q</font> as   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> ;<br/>
<a NAME="E3:55_2"/><i><font color="Green">E32</font></i>: 
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">q1</font></span><a href="domain_1.html#K6">}</a></span> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">V</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">q1</font> <a href="lattice3.html#K12">"/\"</a> <font color="Olive">y</font></span>)</span> where <font color="Olive">y</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> : <font color="Olive">y</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font> </span>}</span> 
 
<b>by </b><i><a class="ref" href="yellow_4.html#T42">YELLOW_4:42</a></i>;<br/>
<a NAME="E4:55_2"/>
<font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">q1</font></span><a href="domain_1.html#K6">}</a></span> <a href="tarski.html#R1">c=</a> <font color="Maroon">V</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="55_2_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">t</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:55_2_1"/>
<font color="Maroon">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">q1</font></span><a href="domain_1.html#K6">}</a></span>
 ;<br/>

<b>then consider </b><font color="Maroon">y</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E3:55_2_1"/><i><font color="Green">E33</font></i>: 
<font color="Maroon">t</font> <a href="hidden.html#R1">=</a> <font color="Maroon">q1</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">y</font>
 <b>and </b><br/><a NAME="E4:55_2_1"/><i><font color="Green">E78</font></i>: 
<font color="Maroon">y</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font>
 <b>by </b><i/>;<br/>
<a NAME="E5:55_2_1"/>
<font color="Maroon">q1</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">y</font> <a href="hidden.html#R2">in</a> <font color="Maroon">N</font> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">V</font>
 
<b>by </b><i>, <a class="ref" href="waybel12.html#T2" target="_self">Th2</a></i>;<br/>
<b>hence </b><a NAME="E6:55_2_1"/>
<font color="Maroon">t</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font>
 <b>by </b><i><a class="txt" href="waybel12.html#E3:55_2_1"><i><font color="Green">E33</font></i></a>, </i>;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E5:55_2"/>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">G</font>
 ;<br/>


</div><b>end;</b></div>
<a NAME="E8:55"/>
<font color="Maroon">F</font> <a href="hidden.html#R1">=</a>  <a href="waybel_0.html#K4">uparrow</a> <span class="p1">(<span class="default"><a href="waybel_0.html#K12">fininfs</a> <font color="Maroon">N</font></span>)</span>
 
<b>by </b><i>, <a class="txt" href="waybel12.html#E1:55"><i><font color="Green">E25</font></i></a></i>;<br/>
<a NAME="E9:55"/><b>then </b><i><font color="Green">E79</font></i>: 
<font color="Maroon">F</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">G</font>
 
<b>by </b><i><a class="ref" href="waybel12.html#D2" target="_self">Def2</a>, <a class="ref" href="waybel_0.html#T62">WAYBEL_0:62</a></i>;<br/>
<a NAME="E10:55"/>
<font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">F</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">V</font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="55_3"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">q</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:55_3"/>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">F</font>
 ;<br/>

<b>then consider </b><font color="Maroon">d</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font>, <font color="Maroon">f</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E3:55_3"/><i><font color="Green">E93</font></i>: 
<font color="Maroon">q</font> <a href="hidden.html#R1">=</a> <font color="Maroon">d</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">f</font>
 <b>and </b><br/><a NAME="E4:55_3"/><i><font color="Green">E94</font></i>: 
<font color="Maroon">d</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font>
 <b>and </b><br/><a NAME="E5:55_3"/><i><font color="Green">E95</font></i>: 
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">F</font>
 ;<br/>
<a NAME="E6:55_3"/>
<font color="Maroon">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">G</font>
 
<b>by </b><i>, <a class="ref" href="waybel12.html#T2" target="_self">Th2</a></i>;<br/>
<b>then consider </b><font color="Maroon">x</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E8:55_3"/><i><font color="Green">E96</font></i>: 
<font color="Maroon">f</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font>
 <b>and </b><br/><a NAME="E9:55_3"/><i><font color="Green">E97</font></i>: 
<font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">x</font></span><a href="domain_1.html#K6">}</a></span> <a href="tarski.html#R1">c=</a> <font color="Maroon">V</font>
 ;<br/>
<a NAME="E10:55_3"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">x</font></span><a href="domain_1.html#K6">}</a></span>
 
<b>by </b><i><a class="ref" href="tarski.html#D1">TARSKI:def 1</a></i>;<br/>
<a NAME="E11:55_3"/><b>then </b>
<font color="Maroon">d</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">f</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font> <a href="yellow_4.html#K4">"/\"</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">x</font></span><a href="domain_1.html#K6">}</a></span>
 
<b>by </b><i>, </i>;<br/>
<b>hence </b><a NAME="E12:55_3"/>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">V</font>
 <b>by </b><i>, <a class="ref" href="waybel12.html#T3" target="_self">Th3</a></i>;<br/>


</div><b>end;</b></div>
<b>then consider </b><font color="Maroon">O</font> being  <a href="waybel_6.html#V1">Open</a> <a href="waybel_0.html#NM4">Filter</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E12:55"/><i><font color="Green">E110</font></i>: 
<font color="Maroon">O</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">V</font>
 <b>and </b><br/><a NAME="E13:55"/><i><font color="Green">E112</font></i>: 
<font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">O</font>
 <b>and </b><br/><a NAME="E14:55"/><i><font color="Green">E113</font></i>: 
<font color="Maroon">F</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">O</font>
 <b>by </b><i>, , </i>;<br/>
<b>take </b>
<font color="Maroon">O</font>
;<br/>

<a NAME="E15:55"/><i><font color="Green">E114</font></i>: 
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v</font></span><a href="domain_1.html#K6">}</a></span> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">N</font> <a href="hidden.html#R1">=</a> <span class="p1">{<span class="default"> <span class="p2">(<span class="default"><font color="Maroon">v</font> <a href="lattice3.html#K12">"/\"</a> <font color="Olive">n</font></span>)</span> where <font color="Olive">n</font> is   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font> : <font color="Olive">n</font> <a href="hidden.html#R2">in</a> <font color="Maroon">N</font> </span>}</span> 
 
<b>by </b><i><a class="ref" href="yellow_4.html#T42">YELLOW_4:42</a></i>;<br/>
<b>thus </b><a NAME="E16:55"/>
<span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v</font></span><a href="domain_1.html#K6">}</a></span> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">N</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">O</font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="55_4"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">q</font> be    <a href="hidden.html#M1">set</a> ; <i><font color="Red">:: according to </font></i><a class="ref" href="tarski.html#D3">TARSKI:def 3</a><br/>

<b>assume </b><a NAME="E1:55_4"/>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <span class="p1"><a href="domain_1.html#K6">{</a><span class="default"><font color="Maroon">v</font></span><a href="domain_1.html#K6">}</a></span> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">N</font>
 ;<br/>

<b>then consider </b><font color="Maroon">n</font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">L</font><b> such that </b><br/><a NAME="E3:55_4"/><i><font color="Green">E115</font></i>: 
<font color="Maroon">q</font> <a href="hidden.html#R1">=</a> <font color="Maroon">v</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">n</font>
 <b>and </b><br/><a NAME="E4:55_4"/><i><font color="Green">E117</font></i>: 
<font color="Maroon">n</font> <a href="hidden.html#R2">in</a> <font color="Maroon">N</font>
 <b>by </b><i/>;<br/>
<a NAME="E5:55_4"/>
<font color="Maroon">N</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">F</font>
 
<b>by </b><i>, <a class="txt" href="waybel12.html#E2:55"><i><font color="Green">E26</font></i></a></i>;<br/>
<a NAME="E6:55_4"/><b>then </b>
<font color="Maroon">N</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">O</font>
 
<b>by </b><i><a class="ref" href="waybel12.html#T2" target="_self">Th2</a>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>
<a NAME="E7:55_4"/><b>then </b>
<font color="Maroon">v</font> <a href="lattice3.html#K12">"/\"</a> <font color="Maroon">n</font> <a href="hidden.html#R2">in</a> <font color="Maroon">O</font> <a href="yellow_4.html#K4">"/\"</a> <font color="Maroon">O</font>
 
<b>by </b><i>, <a class="ref" href="waybel12.html#T4" target="_self">Th4</a></i>;<br/>
<b>hence </b><a NAME="E8:55_4"/>
<font color="Maroon">q</font> <a href="hidden.html#R2">in</a> <font color="Maroon">O</font>
 <b>by </b><i><a class="ref" href="waybel12.html#T3" target="_self">Th3</a>, </i>;<br/>


</div><b>end;</b></div>

<b>thus </b><a NAME="E17:55"/>
( <font color="Maroon">O</font> <a href="tarski.html#R1">c=</a> <font color="Maroon">V</font> &amp; <font color="Maroon">v</font> <a href="hidden.html#R2">in</a> <font color="Maroon">O</font> )
 <b>by </b><i>, </i>;<br/>


</div>
