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<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="hidden.html#M1">set</a> ,  <a href="finseq_1.html#NM1">FinSequence</a>] <b>means </b>( <font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">a<sub>1</sub></font>,<font color="Maroon">a<sub>2</sub></font> <a href="funct_1.html#K1">.</a> 1,<font color="Maroon">a<sub>2</sub></font> <a href="funct_1.html#K1">.</a> 2] &amp; <font color="Maroon">a<sub>2</sub></font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">a<sub>2</sub></font> <a href="funct_1.html#K1">.</a> 1</span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">a<sub>2</sub></font> <a href="funct_1.html#K1">.</a> 2</span>)</span></span><a href="finseq_1.html#K10">*&gt;</a></span> );<br/>
<b>consider </b><font color="Maroon">G</font> being  non <a href="struct_0.html#V3">empty</a> <a href="lang1.html#V1">strict</a>  <a href="lang1.html#L1">DTConstrStr</a> <b> such that </b><br/><a NAME="E2:18_1"/><i><font color="Green">E29</font></i>: 
the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>1</sub></font>()
 <b>and </b><br/><a NAME="E3:18_1"/><i><font color="Green">E30</font></i>: 
for <font color="Olive">x</font> being  <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font><br/> for <font color="Olive">p</font> being   <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> holds <br/> ( <font color="Olive">x</font> <a href="lang1.html#R1">==&gt;</a> <font color="Olive">p</font> iff <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">p</font>] )
 <b>from </b><i><a class="ref" href="dtconstr.html#S1">DTCONSTR:sch 1</a>();<br/></i>
<div><i><font color="Green">E32</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="18_1_1"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">x</font> be   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font>, <font color="Maroon">y</font> be   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font>, <font color="Maroon">z</font> be   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font>;<br/><b>reconsider </b><font color="Maroon">yz</font> = <span class="p1"><a href="lang1.html#K4">&lt;*</a><span class="default"><font color="Maroon">y</font>,<font color="Maroon">z</font></span><a href="lang1.html#K4">*&gt;</a></span> as    <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> ;<br/><a NAME="E2:18_1_1"/>
( <font color="Maroon">yz</font> <a href="funct_1.html#K1">.</a> 1 <a href="hidden.html#R1">=</a> <font color="Maroon">y</font> &amp; <font color="Maroon">yz</font> <a href="funct_1.html#K1">.</a> 2 <a href="hidden.html#R1">=</a> <font color="Maroon">z</font> )
 <b>by </b><i><a class="ref" href="finseq_1.html#T61">FINSEQ_1:61</a></i>;<br/><b>hence </b><a NAME="E3:18_1_1"/>
( <font color="Maroon">x</font> <a href="lang1.html#R1">==&gt;</a> <span class="p1"><a href="lang1.html#K4">&lt;*</a><span class="default"><font color="Maroon">y</font>,<font color="Maroon">z</font></span><a href="lang1.html#K4">*&gt;</a></span> iff <font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">x</font>,<font color="Maroon">y</font>,<font color="Maroon">z</font>] )
 <b>by </b><i/>;<br/></div><b>end;</b></div>
<div><a class="txt" onclick="hs2(this)" href="javascript:()" title="18_1_2"><b>now </b></a><div class="add"><b>let </b><font color="Maroon">s</font> be   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font>;<br/><b>let </b><font color="Maroon">p</font> be   <a href="finseq_1.html#NM1">FinSequence</a>;<br/><b>assume </b><a NAME="E1:18_1_2"/><i><font color="Green">E35</font></i>: 
<font color="Maroon">s</font> <a href="lang1.html#R1">==&gt;</a> <font color="Maroon">p</font>
 ;<br/><a NAME="E2:18_1_2"/><b>then </b>
<span class="p1"><a href="tarski.html#K4">[</a><span class="default"><font color="Maroon">s</font>,<font color="Maroon">p</font></span><a href="tarski.html#K4">]</a></span> <a href="hidden.html#R2">in</a> the <a href="lang1.html#U1">Rules</a> of <font color="Maroon">G</font>
 <b>by </b><i><a class="ref" href="lang1.html#D1">LANG1:def 1</a></i>;<br/><a NAME="E3:18_1_2"/><b>then </b>
<font color="Maroon">p</font> <a href="hidden.html#R2">in</a> the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> <a href="finseq_1.html#K13">*</a> 
 <b>by </b><i><a class="ref" href="zfmisc_1.html#T106">ZFMISC_1:106</a></i>;<br/><b>then reconsider </b><font color="Maroon">pp</font> = <font color="Maroon">p</font> as    <a href="finseq_1.html#M2">FinSequence</a> of the <a href="struct_0.html#U1">carrier</a> of <font color="Maroon">G</font> <b>by </b><i><a class="ref" href="finseq_2.html#D3">FINSEQ_2:def 3</a></i>;<br/><a NAME="E5:18_1_2"/>
( <font color="Maroon">P<sub>1</sub></font>[<font color="Maroon">s</font>,<font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1,<font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2] &amp; <font color="Maroon">pp</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1</span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2</span>)</span></span><a href="finseq_1.html#K10">*&gt;</a></span> )
 <b>by </b><i>, </i>;<br/><b>then </b> <a href="relset_1.html#K5">rng</a> <font color="Maroon">pp</font> = 
 <a href="relat_1.html#K2">rng</a> <span class="p1">(<span class="default"><span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><span class="p3">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1</span>)</span></span><a href="finseq_1.html#K9">*&gt;</a></span> <a href="finseq_1.html#K7">^</a> <span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><span class="p3">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2</span>)</span></span><a href="finseq_1.html#K9">*&gt;</a></span></span>)</span>
<b>by </b><i><a class="ref" href="finseq_1.html#D9">FINSEQ_1:def 9</a></i>
<br/>.= 
<span class="p1">(<span class="default"><a href="relat_1.html#K2">rng</a> <span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><span class="p3">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1</span>)</span></span><a href="finseq_1.html#K9">*&gt;</a></span></span>)</span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><a href="relat_1.html#K2">rng</a> <span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><span class="p3">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2</span>)</span></span><a href="finseq_1.html#K9">*&gt;</a></span></span>)</span>
<b>by </b><i><a class="ref" href="finseq_1.html#T44">FINSEQ_1:44</a></i>
<br/>.= 
<span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1</span>)</span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <span class="p1">(<span class="default"><a href="relat_1.html#K2">rng</a> <span class="p2"><a href="finseq_1.html#K9">&lt;*</a><span class="default"><span class="p3">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2</span>)</span></span><a href="finseq_1.html#K9">*&gt;</a></span></span>)</span>
<b>by </b><i><a class="ref" href="finseq_1.html#T56">FINSEQ_1:56</a></i>
<br/>.= 
<span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1</span>)</span></span><a href="tarski.html#K1">}</a></span> <a href="xboole_0.html#K2">\/</a> <span class="p1"><a href="tarski.html#K1">{</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2</span>)</span></span><a href="tarski.html#K1">}</a></span>
<b>by </b><i><a class="ref" href="finseq_1.html#T56">FINSEQ_1:56</a></i>
<br/>.= 
<span class="p1"><a href="tarski.html#K2">{</a><span class="default"><span class="p2">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1</span>)</span>,<span class="p2">(<span class="default"><font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2</span>)</span></span><a href="tarski.html#K2">}</a></span>
<b>by </b><i><a class="ref" href="enumset1.html#T41">ENUMSET1:41</a></i>
;<br/><a NAME="E7:18_1_2"/><b>then </b>
( <font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1 <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K5">rng</a> <font color="Maroon">pp</font> &amp; <font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2 <a href="hidden.html#R2">in</a>  <a href="relset_1.html#K5">rng</a> <font color="Maroon">pp</font> )
 <b>by </b><i><a class="ref" href="tarski.html#D2">TARSKI:def 2</a></i>;<br/><b>then reconsider </b><font color="Maroon">pp1</font> = <font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 1, <font color="Maroon">pp2</font> = <font color="Maroon">pp</font> <a href="funct_1.html#K1">.</a> 2 as   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font> ;<br/><b>take </b><font color="Maroon">pp1</font> = <font color="Maroon">pp1</font>;<br/><b>take </b><font color="Maroon">pp2</font> = <font color="Maroon">pp2</font>;<br/><b>thus </b><a NAME="E9:18_1_2"/>
<font color="Maroon">p</font> <a href="hidden.html#R1">=</a> <span class="p1"><a href="lang1.html#K4">&lt;*</a><span class="default"><font color="Maroon">pp1</font>,<font color="Maroon">pp2</font></span><a href="lang1.html#K4">*&gt;</a></span>
 <b>by </b><i>, </i>;<br/></div><b>end;</b></div>
<a NAME="E6:18_1"/><b>then </b>
<font color="Maroon">G</font> is <a href="bintree1.html#V3" target="_self">binary</a>
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E7:18_1"/>
 ex <font color="Olive">G</font> being non <a href="struct_0.html#V3">empty</a> <a href="lang1.html#V1">strict</a> <a href="bintree1.html#V3" target="_self">binary</a>  <a href="lang1.html#L1">DTConstrStr</a>  st <br/>( the <a href="struct_0.html#U1">carrier</a> of <font color="Olive">G</font> <a href="hidden.html#R1">=</a> <font color="Maroon">F<sub>1</sub></font>() &amp; ( for <font color="Olive">x</font>, <font color="Olive">y</font>, <font color="Olive">z</font> being  <a href="lang1.html#NM1">Symbol</a> of <font color="Olive">G</font> holds <br/> ( <font color="Olive">x</font> <a href="lang1.html#R1">==&gt;</a> <span class="p1"><a href="lang1.html#K4">&lt;*</a><span class="default"><font color="Olive">y</font>,<font color="Olive">z</font></span><a href="lang1.html#K4">*&gt;</a></span> iff <font color="Maroon">P<sub>1</sub></font>[<font color="Olive">x</font>,<font color="Olive">y</font>,<font color="Olive">z</font>] ) ) )
 <b>by </b><i>, </i>;<br/>


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