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<b>let </b><font color="Maroon">D</font> be  non <a href="xboole_0.html#V1">empty</a>  <a href="hidden.html#M1">set</a> ;<br/>

<a NAME="E1:24"/><i><font color="Green">E49</font></i>: 
 <a href="xboole_0.html#K1">{}</a>  is    <a href="finseq_1.html#M2">FinSequence</a> of <font color="Maroon">D</font>
 
<b>by </b><i><a class="ref" href="finseq_1.html#T29">FINSEQ_1:29</a></i>;<br/>
<a NAME="E2:24"/>
 <a href="finseq_1.html#K3">len</a> <a href="xboole_0.html#K1">{}</a>  <a href="hidden.html#R1">=</a> 0
 
<b>by </b><i><a class="ref" href="finseq_1.html#T25">FINSEQ_1:25</a></i>;<br/>
<b>hence </b><a NAME="E3:24"/>
<span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><a href="xboole_0.html#K1">{}</a> ,<a href="xboole_0.html#K1">{}</a> </span><a href="finseq_1.html#K10">*&gt;</a></span> is    <a href="matrix_1.html#M1" target="_self">Matrix</a> of 2,0,<font color="Maroon">D</font>
 <b>by </b><i>, </i>;<br/>


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