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<a NAME="E1:26_2_1"/>
(  <a href="relset_1.html#K4">dom</a> <font color="Maroon">seq1</font> <a href="hidden.html#R1">=</a>  <a href="numbers.html#K5">NAT</a>  &amp;  <a href="relset_1.html#K4">dom</a> <font color="Maroon">seq2</font> <a href="hidden.html#R1">=</a>  <a href="numbers.html#K5">NAT</a>  )
 
<b>by </b><i><a class="ref" href="funct_2.html#D1">FUNCT_2:def 1</a></i>;<br/>
<a NAME="E2:26_2_1"/><b>then </b>
 <a href="relset_1.html#K4">dom</a> <span class="p1">(<span class="default"><font color="Maroon">seq1</font> <a href="seq_1.html#K7" target="_self">-</a> <font color="Maroon">seq2</font></span>)</span> <a href="hidden.html#R1">=</a> <a href="numbers.html#K5">NAT</a>  <a href="subset_1.html#K9">/\</a> <a href="numbers.html#K5">NAT</a> 
 
<b>by </b><i/>;<br/>
<b>hence </b><a NAME="E3:26_2_1"/>
<font color="Maroon">seq1</font> <a href="seq_1.html#K4" target="_self">-</a> <font color="Maroon">seq2</font> is   <a href="seq_1.html#NM1">Real_Sequence</a>
 <b>by </b><i><a class="ref" href="funct_2.html#T130">FUNCT_2:130</a></i>;<br/>


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