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<b>defpred </b><font color="Maroon">S<sub>1</sub></font>[   <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">D</font>] <b>means </b>( <font color="Maroon">a<sub>1</sub></font> <a href="hidden.html#R2">in</a>  <a href="xboole_0.html#K1">{}</a>  &amp; contradiction );<br/>
<a NAME="E1:25_1_1"/><i><font color="Green">E23</font></i>: 
for <font color="Olive">a</font>, <font color="Olive">b</font> being   <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">D</font>  st <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">a</font>] &amp; <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">b</font>] holds <br/> <a href="finseq_1.html#K3">len</a> <font color="Olive">a</font> <a href="hidden.html#R1">=</a>  <a href="finseq_1.html#K3">len</a> <font color="Olive">b</font>
 
;<br/>
<b>consider </b><font color="Maroon">r</font> being    <a href="subset_1.html#M1">Element</a> of  <a href="margrel1.html#K3" target="_self">relations_on</a> <font color="Maroon">D</font><b> such that </b><br/><a NAME="E3:25_1_1"/><i><font color="Green">E36</font></i>: 
for <font color="Olive">a</font> being   <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">D</font> holds <br/> ( <font color="Olive">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">r</font> iff <font color="Maroon">S<sub>1</sub></font>[<font color="Olive">a</font>] )
 <b>from </b><i><a class="ref" href="margrel1.html#S2" target="_self">MARGREL1:sch 2</a>();<br/></i>
<b>take </b>
<font color="Maroon">r</font>
;<br/>

<b>thus </b><a NAME="E4:25_1_1"/>
for <font color="Olive">a</font> being   <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">D</font>  holds not <font color="Olive">a</font> <a href="hidden.html#R2">in</a> <font color="Maroon">r</font>
 <b>by </b><i/>;<br/>


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