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<b>take </b><font color="Maroon">M</font> =  <a href="xboole_0.html#K1">{}</a> ;<br/>

<b>take </b>
0
; <i><font color="Red">:: according to </font></i><a class="ref" href="matrix_1.html#D1" target="_self">MATRIX_1:def 1</a><br/>

<b>let </b><font color="Maroon">x</font> be    <a href="hidden.html#M1">set</a> ;<br/>

<b>assume </b><a NAME="E1:2_1_1"/>
<font color="Maroon">x</font> <a href="hidden.html#R2">in</a>  <a href="relat_1.html#K2">rng</a> <font color="Maroon">M</font>
 ;<br/>

<b>hence </b><a NAME="E2:2_1_1"/>
 ex <font color="Olive">s</font> being  <a href="finseq_1.html#NM1">FinSequence</a> st <br/>( <font color="Olive">s</font> <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> &amp;  <a href="finseq_1.html#K3">len</a> <font color="Olive">s</font> <a href="hidden.html#R1">=</a> 0 )
 ;<br/>


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