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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/>

<b>thus </b> <a href="card_3.html#K4">product</a> <span class="p1"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Maroon">D</font>,<font color="Maroon">D</font></span><a href="finseq_1.html#K10">*&gt;</a></span> = 
<span class="p1">{<span class="default"> <span class="p2"><a href="finseq_1.html#K10">&lt;*</a><span class="default"><font color="Olive">d1</font>,<font color="Olive">d2</font></span><a href="finseq_1.html#K10">*&gt;</a></span> where <font color="Olive">d1</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D</font>, <font color="Olive">d2</font> is    <a href="subset_1.html#M1">Element</a> of <font color="Maroon">D</font> : verum </span>}</span> 
<b>by </b><i/>
<br/>.= 
2 <a href="finseq_2.html#K4">-tuples_on</a> <font color="Maroon">D</font>
<b>by </b><i><a class="ref" href="finseq_2.html#T119">FINSEQ_2:119</a></i>
;<br/>


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