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<b>consider </b><font color="Maroon">s</font> being   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font>;<br/>
<div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="34_1_1_1"><b>per </b></a><a class="txt" onclick="hs(this)" href="javascript:()"><b>cases </b></a><span class="hide"><a NAME="E1:34_1_1_1"/>
( for <font color="Olive">tnt</font> being  <a href="finseq_1.html#NM1">FinSequence</a>  holds not <font color="Maroon">s</font> <a href="lang1.html#R1">==&gt;</a> <font color="Olive">tnt</font> or  ex <font color="Olive">tnt</font> being  <a href="finseq_1.html#NM1">FinSequence</a> st <font color="Maroon">s</font> <a href="lang1.html#R1">==&gt;</a> <font color="Olive">tnt</font> )
 </span>;<br/><div class="add"><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="34_1_1_1_1"><b>suppose </b></a><a NAME="E1:34_1_1_1_1"/>
for <font color="Olive">tnt</font> being  <a href="finseq_1.html#NM1">FinSequence</a>  holds not <font color="Maroon">s</font> <a href="lang1.html#R1">==&gt;</a> <font color="Olive">tnt</font>
 ;<br/><div class="add"><a NAME="E2:34_1_1_1_1"/><b>then </b>
<font color="Maroon">s</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">t</font> where <font color="Olive">t</font> is   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font> : for <font color="Olive">tnt</font> being  <a href="finseq_1.html#NM1">FinSequence</a>  holds not <font color="Olive">t</font> <a href="lang1.html#R1">==&gt;</a> <font color="Olive">tnt</font> </span>}</span> 
 ;<br/><a NAME="E3:34_1_1_1_1"/><b>then </b>
<font color="Maroon">s</font> <a href="hidden.html#R2">in</a>  <a href="lang1.html#K5">Terminals</a> <font color="Maroon">G</font>
 <b>by </b><i><a class="ref" href="lang1.html#D2">LANG1:def 2</a></i>;<br/><b>hence </b><a NAME="E4:34_1_1_1_1"/>
not  <a href="dtconstr.html#K4" target="_self">TS</a> <font color="Maroon">G</font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i/>;<br/></div><b>end;</b></div><div><a class="txt" onclick="hsNdiv(this)" href="javascript:()" title="34_1_1_1_2"><b>suppose </b></a><a NAME="E1:34_1_1_1_2"/>
 ex <font color="Olive">tnt</font> being  <a href="finseq_1.html#NM1">FinSequence</a> st <font color="Maroon">s</font> <a href="lang1.html#R1">==&gt;</a> <font color="Olive">tnt</font>
 ;<br/><div class="add"><a NAME="E2:34_1_1_1_2"/><b>then </b>
<font color="Maroon">s</font> <a href="hidden.html#R2">in</a> <span class="p1">{<span class="default"> <font color="Olive">t</font> where <font color="Olive">t</font> is   <a href="lang1.html#NM1">Symbol</a> of <font color="Maroon">G</font> :  ex <font color="Olive">tnt</font> being  <a href="finseq_1.html#NM1">FinSequence</a> st <font color="Olive">t</font> <a href="lang1.html#R1">==&gt;</a> <font color="Olive">tnt</font> </span>}</span> 
 ;<br/><a NAME="E3:34_1_1_1_2"/><b>then </b>
<font color="Maroon">s</font> <a href="hidden.html#R2">in</a>  <a href="lang1.html#K6">NonTerminals</a> <font color="Maroon">G</font>
 <b>by </b><i><a class="ref" href="lang1.html#D3">LANG1:def 3</a></i>;<br/><b>then consider </b><font color="Maroon">p</font> being    <a href="trees_4.html#M1">FinSequence</a> of  <a href="dtconstr.html#K4" target="_self">TS</a> <font color="Maroon">G</font><b> such that </b><br/><a NAME="E5:34_1_1_1_2"/><i><font color="Green">E31</font></i>: 
<font color="Maroon">s</font> <a href="lang1.html#R1">==&gt;</a>  <a href="dtconstr.html#K1" target="_self">roots</a> <font color="Maroon">p</font>
 <b>by </b><i/>;<br/><b>thus </b><a NAME="E6:34_1_1_1_2"/>
not  <a href="dtconstr.html#K4" target="_self">TS</a> <font color="Maroon">G</font> is <a href="xboole_0.html#V1">empty</a>
 <b>by </b><i>, </i>;<br/></div><b>end;</b></div></div><b>end;</b></div>

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