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

<b>let </b><font color="Maroon">c<sub>1</sub></font> be  non <a href="struct_0.html#V3">empty</a> <a href="sheffer1.html#V9" target="_self">properly_defined</a> <a href="sheffer1.html#V10" target="_self">satisfying_Sheffer_1</a> <a href="sheffer1.html#V11" target="_self">satisfying_Sheffer_2</a> <a href="sheffer1.html#V12" target="_self">satisfying_Sheffer_3</a>  <a href="sheffer1.html#L3" target="_self">ShefferOrthoLattStr</a> ;<br/>

<a NAME="E1:60"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font> st <br/>for <font color="Olive">b<sub>2</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font> holds <br/>( <font color="Olive">b<sub>1</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>2</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>2</sub></font> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1"><b>proof </b></a><div class="add">

<b>consider </b><font color="Maroon">c<sub>2</sub></font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>
<b>take </b><font color="Maroon">c<sub>3</sub></font> = <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>;<br/>

<b>let </b><font color="Maroon">c<sub>4</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>thus </b><a NAME="E2:60_1"/>
<font color="Maroon">c<sub>3</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_1"><b>proof </b></a><div class="add">

<font color="Maroon">c<sub>3</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>4</sub></font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T33" target="_self">Th33</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T31" target="_self">Th31</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T32" target="_self">Th32</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_1_1"/>
<font color="Maroon">c<sub>3</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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

<b>thus </b><a NAME="E3:60_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_1_2"><b>proof </b></a><div class="add">

<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>3</sub></font> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T33" target="_self">Th33</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T31" target="_self">Th31</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_1_2"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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


</div><b>end;</b></div>
<a NAME="E2:60"/><b>then </b><i><font color="Green">E46</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="sheffer1.html#V2" target="_self">lower-bounded'</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#D3" target="_self">Def3</a></i>;<br/>
<a NAME="E3:60"/>
ex <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font> st <br/>for <font color="Olive">b<sub>2</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font> holds <br/>( <font color="Olive">b<sub>1</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Olive">b<sub>2</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>2</sub></font> &amp; <font color="Olive">b<sub>2</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>2</sub></font> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_2"><b>proof </b></a><div class="add">

<b>consider </b><font color="Maroon">c<sub>2</sub></font> being   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>
<b>take </b><font color="Maroon">c<sub>3</sub></font> = <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>;<br/>

<b>let </b><font color="Maroon">c<sub>4</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>thus </b><a NAME="E2:60_2"/>
<font color="Maroon">c<sub>3</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_2_1"><b>proof </b></a><div class="add">

<b>set </b><font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> ;<br/>
<font color="Maroon">c<sub>3</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>4</sub></font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 
<b>by </b><i><a class="ref" href="sheffer1.html#T32" target="_self">Th32</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_2_1"/>
<font color="Maroon">c<sub>3</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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

<b>thus </b><a NAME="E3:60_2"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_2_2"><b>proof </b></a><div class="add">

<b>set </b><font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> ;<br/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>3</sub></font> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_2_2"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>3</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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


</div><b>end;</b></div>
<a NAME="E4:60"/><b>then </b><i><font color="Green">E47</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="sheffer1.html#V1" target="_self">upper-bounded'</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#D1" target="_self">Def1</a></i>;<br/>
<a NAME="E5:60"/>
for <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>ex <font color="Olive">b<sub>2</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font> st <font color="Olive">b<sub>2</sub></font> <a href="sheffer1.html#R1" target="_self">is_a_complement'_of</a> <font color="Olive">b<sub>1</sub></font>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>2</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<a NAME="E1:60_3"/><i><font color="Green">E48</font></i>: 
 <a href="sheffer1.html#K1" target="_self">Top'</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_1"><b>proof </b></a><div class="add">

<b>set </b><font color="Maroon">c<sub>3</sub></font> = <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>;<br/>
<a NAME="E1:60_3_1"/>
for <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font> holds <br/>( <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K2">"/\"</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="lattices.html#K2">"/\"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_1_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>4</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>thus </b><a NAME="E1:60_3_1_1"/>
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_1_1_1"><b>proof </b></a><div class="add">

<b>set </b><font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> ;<br/>
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>4</sub></font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 
<b>by </b><i><a class="ref" href="sheffer1.html#T32" target="_self">Th32</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_3_1_1_1"/>
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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

<b>thus </b><a NAME="E2:60_3_1_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K2">"/\"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_1_1_2"><b>proof </b></a><div class="add">

<b>set </b><font color="Maroon">c<sub>5</sub></font> = <font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> ;<br/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K2">"/\"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> 
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_3_1_1_2"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K2">"/\"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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

<b>thus </b><a NAME="E3:60_3_1_1"/>
verum
 ;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E2:60_3_1"/>
 <a href="sheffer1.html#K1" target="_self">Top'</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
 <b>by </b><i><a class="txt" href="sheffer1.html#E4:60"><i><font color="Green">E47</font></i></a>, <a class="ref" href="sheffer1.html#D2" target="_self">Def2</a></i>;<br/>


</div><b>end;</b></div>
<a NAME="E2:60_3"/><i><font color="Green">E49</font></i>: 
 <a href="sheffer1.html#K2" target="_self">Bot'</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_2"><b>proof </b></a><div class="add">

<b>set </b><font color="Maroon">c<sub>3</sub></font> = <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>;<br/>
<a NAME="E1:60_3_2"/>
for <font color="Olive">b<sub>1</sub></font> being  <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font> holds <br/>( <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K1">"\/"</a> <font color="Olive">b<sub>1</sub></font> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font> &amp; <font color="Olive">b<sub>1</sub></font> <a href="lattices.html#K1">"\/"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Olive">b<sub>1</sub></font> )
 
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_2_1"><b>proof </b></a><div class="add">

<b>let </b><font color="Maroon">c<sub>4</sub></font> be   <a href="struct_0.html#NM1">Element</a> of <font color="Maroon">c<sub>1</sub></font>;<br/>

<b>thus </b><a NAME="E1:60_3_2_1"/>
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_2_1_1"><b>proof </b></a><div class="add">

<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>4</sub></font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T33" target="_self">Th33</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T31" target="_self">Th31</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T32" target="_self">Th32</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_3_2_1_1"/>
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>4</sub></font> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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

<b>thus </b><a NAME="E2:60_3_2_1"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K1">"\/"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 <div><a class="txt" onclick="hs2(this)" href="javascript:()" title="60_3_2_1_2"><b>proof </b></a><div class="add">

<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K1">"\/"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> = 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span>

<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><span class="p3">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p4">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span> <a href="sheffer1.html#K6" target="_self">"</a> </span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T33" target="_self">Th33</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T31" target="_self">Th31</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>4</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>4</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D14" target="_self">Def14</a></i>
<br/>.= 
<font color="Maroon">c<sub>4</sub></font>
<b>by </b><i><a class="ref" href="sheffer1.html#D13" target="_self">Def13</a></i>
;<br/>
<b>hence </b><a NAME="E2:60_3_2_1_2"/>
<font color="Maroon">c<sub>4</sub></font> <a href="lattices.html#K1">"\/"</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p3">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span></span>)</span> <a href="hidden.html#R1">=</a> <font color="Maroon">c<sub>4</sub></font>
 ;<br/>


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

<b>thus </b><a NAME="E3:60_3_2_1"/>
verum
 ;<br/>


</div><b>end;</b></div>
<b>hence </b><a NAME="E2:60_3_2"/>
 <a href="sheffer1.html#K2" target="_self">Bot'</a> <font color="Maroon">c<sub>1</sub></font> <a href="hidden.html#R1">=</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span>
 <b>by </b><i><a class="txt" href="sheffer1.html#E2:60"><i><font color="Green">E46</font></i></a>, <a class="ref" href="sheffer1.html#D4" target="_self">Def4</a></i>;<br/>


</div><b>end;</b></div>
<b>set </b><font color="Maroon">c<sub>3</sub></font> = <font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font>;<br/>
<b>take </b>
<font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font>
;<br/>

<i><font color="Green">E50</font></i>: <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="lattices.html#K1">"\/"</a> <font color="Maroon">c<sub>2</sub></font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
 <a href="sheffer1.html#K1" target="_self">Top'</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="txt" href="sheffer1.html#E1:60_3"><i><font color="Green">E48</font></i></a>, <a class="ref" href="sheffer1.html#T32" target="_self">Th32</a></i>
;<br/>
<a NAME="E4:60_3"/><i><font color="Green">E51</font></i>: 
<font color="Maroon">c<sub>2</sub></font> <a href="lattices.html#K1">"\/"</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="sheffer1.html#K1" target="_self">Top'</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="sheffer1.html#E1:60_3"><i><font color="Green">E48</font></i></a>, <a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>;<br/>
<i><font color="Green">E52</font></i>: <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="lattices.html#K2">"/\"</a> <font color="Maroon">c<sub>2</sub></font> = 
<span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>
<br/>.= 
<span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span>
<b>by </b><i><a class="ref" href="sheffer1.html#T32" target="_self">Th32</a></i>
<br/>.= 
 <a href="sheffer1.html#K2" target="_self">Bot'</a> <font color="Maroon">c<sub>1</sub></font>
<b>by </b><i><a class="txt" href="sheffer1.html#E2:60_3"><i><font color="Green">E49</font></i></a>, <a class="ref" href="sheffer1.html#T32" target="_self">Th32</a></i>
;<br/>
<a NAME="E6:60_3"/>
<font color="Maroon">c<sub>2</sub></font> <a href="lattices.html#K2">"/\"</a> <span class="p1">(<span class="default"><font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font></span>)</span> <a href="hidden.html#R1">=</a>  <a href="sheffer1.html#K2" target="_self">Bot'</a> <font color="Maroon">c<sub>1</sub></font>
 
<b>by </b><i><a class="txt" href="sheffer1.html#E2:60_3"><i><font color="Green">E49</font></i></a>, <a class="ref" href="sheffer1.html#D12" target="_self">Def12</a></i>;<br/>
<b>hence </b><a NAME="E7:60_3"/>
<font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#K5" target="_self">|</a> <font color="Maroon">c<sub>2</sub></font> <a href="sheffer1.html#R1" target="_self">is_a_complement'_of</a> <font color="Maroon">c<sub>2</sub></font>
 <b>by </b><i><a class="txt" href="sheffer1.html#E3:60_3"><i><font color="Green">E50</font></i></a>, <a class="txt" href="sheffer1.html#E4:60_3"><i><font color="Green">E51</font></i></a>, <a class="txt" href="sheffer1.html#E5:60_3"><i><font color="Green">E52</font></i></a>, <a class="ref" href="sheffer1.html#D6" target="_self">Def6</a></i>;<br/>


</div><b>end;</b></div>
<a NAME="E6:60"/><b>then </b><i><font color="Green">E48</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="sheffer1.html#V4" target="_self">complemented'</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#D7" target="_self">Def7</a></i>;<br/>
<a NAME="E7:60"/><i><font color="Green">E49</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="lattices.html#V4">join-commutative</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#T34" target="_self">Th34</a></i>;<br/>
<a NAME="E8:60"/><i><font color="Green">E50</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="lattices.html#V6">meet-commutative</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#T35" target="_self">Th35</a></i>;<br/>
<a NAME="E9:60"/><i><font color="Green">E51</font></i>: 
<font color="Maroon">c<sub>1</sub></font> is <a href="lattices.html#V11">distributive</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#T36" target="_self">Th36</a></i>;<br/>
<a NAME="E10:60"/>
<font color="Maroon">c<sub>1</sub></font> is <a href="sheffer1.html#V3" target="_self">distributive'</a>
 
<b>by </b><i><a class="ref" href="sheffer1.html#T37" target="_self">Th37</a></i>;<br/>
<b>hence </b><a NAME="E11:60"/>
<font color="Maroon">c<sub>1</sub></font> is  <a href="lattices.html#V17">Boolean</a> <a href="lattices.html#NM1">Lattice</a>
 <b>by </b><i><a class="txt" href="sheffer1.html#E2:60"><i><font color="Green">E46</font></i></a>, <a class="txt" href="sheffer1.html#E4:60"><i><font color="Green">E47</font></i></a>, <a class="txt" href="sheffer1.html#E6:60"><i><font color="Green">E48</font></i></a>, <a class="txt" href="sheffer1.html#E7:60"><i><font color="Green">E49</font></i></a>, <a class="txt" href="sheffer1.html#E8:60"><i><font color="Green">E50</font></i></a>, <a class="txt" href="sheffer1.html#E9:60"><i><font color="Green">E51</font></i></a>, <a class="ref" href="sheffer1.html#T26" target="_self">Th26</a></i>;<br/>


</div>
