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

<b>let </b><font color="Maroon" title="c1">p</font> be    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="hilbert1.html#K1" title="HILBERT1:func.1">HP-WFF</a> ;<br/>

<b>assume </b><a NAME="E1:21"/><i><font color="Green" title="E16">A1</font></i>: 
<font color="Maroon" title="c1">p</font> <a href="funct_1.html#K1" title="FUNCT_1:func.1">.</a> 1 <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 2
 ;<br/>

<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="21_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:21_1"/>
( <font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V1" title="HILBERT2:attr.1">conjunctive</a> or <font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V2" title="HILBERT2:attr.2">conditional</a> or <font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V3" title="HILBERT2:attr.3">simple</a> or <font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="hilbert1.html#K2" title="HILBERT1:func.2">VERUM</a>  )
 </span><b>by </b><i><a class="ref" href="hilbert2.html#T9" target="_self" title="HILBERT2:th.9">Th9</a></i>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="21_1_1"><b>suppose </b></a><a NAME="E1:21_1_1"/>
<font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V1" title="HILBERT2:attr.1">conjunctive</a>
 ;<br/><div class="add"><b>hence </b><a NAME="E2:21_1_1"/>
<font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V1" title="HILBERT2:attr.1">conjunctive</a>
 ;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="21_1_2"><b>suppose </b></a><a NAME="E1:21_1_2"/>
<font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V2" title="HILBERT2:attr.2">conditional</a>
 ;<br/><div class="add"><b>then consider </b><font color="Maroon" title="c2">r</font>, <font color="Maroon" title="c3">s</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="hilbert1.html#K1" title="HILBERT1:func.1">HP-WFF</a> <b> such that </b><br/><a NAME="E3:21_1_2"/><i><font color="Green" title="E17">A2</font></i>: 
<font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <font color="Maroon" title="c2">r</font> <a href="hilbert1.html#K3" title="HILBERT1:func.3">=&gt;</a> <font color="Maroon" title="c3">s</font>
 <b>by </b><i><a class="ref" href="hilbert2.html#D7" target="_self" title="HILBERT2:def.7">Def7</a></i>;<br/><a NAME="E4:21_1_2"/>
<font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> <span class="p1"><a href="finseq_1.html#K12" title="FINSEQ_1:func.12">&lt;*</a><span class="default">1</span><a href="finseq_1.html#K12" title="FINSEQ_1:func.12">*&gt;</a></span> <a href="finseq_1.html#K7" title="FINSEQ_1:func.7">^</a> <span class="p1">(<span class="default"><font color="Maroon" title="c2">r</font> <a href="finseq_1.html#K7" title="FINSEQ_1:func.7">^</a> <font color="Maroon" title="c3">s</font></span>)</span>
 <b>by </b><i><a class="txt" href="hilbert2.html#E3:21_1_2"><i><font color="Green" title="E17">A2</font></i></a>, <a class="ref" href="finseq_1.html#T45" title="FINSEQ_1:th.45">FINSEQ_1:45</a></i>;<br/><b>hence </b><a NAME="E5:21_1_2"/>
<font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V1" title="HILBERT2:attr.1">conjunctive</a>
 <b>by </b><i><a class="txt" href="hilbert2.html#E1:21"><i><font color="Green" title="E16">A1</font></i></a>, <a class="ref" href="finseq_1.html#T58" title="FINSEQ_1:th.58">FINSEQ_1:58</a></i>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="21_1_3"><b>suppose </b></a><a NAME="E1:21_1_3"/>
<font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V3" title="HILBERT2:attr.3">simple</a>
 ;<br/><div class="add"><b>then consider </b><font color="Maroon" title="c2">n</font> being    <a href="subset_1.html#M1" title="SUBSET_1:mode.1">Element</a> of  <a href="numbers.html#K5" title="NUMBERS:func.5">NAT</a> <b> such that </b><br/><a NAME="E3:21_1_3"/><i><font color="Green" title="E17">A3</font></i>: 
<font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="hilbert2.html#K1" title="HILBERT2:func.1">prop</a> <font color="Maroon" title="c2">n</font>
 <b>by </b><i><a class="ref" href="hilbert2.html#D8" target="_self" title="HILBERT2:def.8">Def8</a></i>;<br/><a NAME="E4:21_1_3"/>
2 <a href="nat_1.html#K2" title="NAT_1:func.2">+</a> <a href="numbers.html#K6" title="NUMBERS:func.6">0</a>  <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a> 2 <a href="nat_1.html#K2" title="NAT_1:func.2">+</a> <span class="p1">(<span class="default">1 <a href="nat_1.html#K2" title="NAT_1:func.2">+</a> <font color="Maroon" title="c2">n</font></span>)</span>
 <b>by </b><i><a class="txt" href="hilbert2.html#E1:21"><i><font color="Green" title="E16">A1</font></i></a>, <a class="txt" href="hilbert2.html#E3:21_1_3"><i><font color="Green" title="E17">A3</font></i></a>, <a class="ref" href="finseq_1.html#T57" title="FINSEQ_1:th.57">FINSEQ_1:57</a></i>;<br/><b>hence </b><a NAME="E5:21_1_3"/>
<font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V1" title="HILBERT2:attr.1">conjunctive</a>
 ;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="21_1_4"><b>suppose </b></a><a NAME="E1:21_1_4"/>
<font color="Maroon" title="c1">p</font> <a href="hidden.html#R1" title="HIDDEN:pred.1">=</a>  <a href="hilbert1.html#K2" title="HILBERT1:func.2">VERUM</a> 
 ;<br/><div class="add"><b>hence </b><a NAME="E2:21_1_4"/>
<font color="Maroon" title="c1">p</font> is <a href="hilbert2.html#V1" title="HILBERT2:attr.1">conjunctive</a>
 <b>by </b><i><a class="txt" href="hilbert2.html#E1:21"><i><font color="Green" title="E16">A1</font></i></a>, <a class="ref" href="finseq_1.html#T57" title="FINSEQ_1:th.57">FINSEQ_1:57</a></i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

</div>
