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<b>let </b><font color="Maroon">seq1</font> be   <a href="seq_1.html#NM1">Real_Sequence</a>;<br/><b>let </b><font color="Maroon">seq2</font> be   <a href="seq_1.html#NM1">Real_Sequence</a>;<br/>



<b>thus </b><font color="Maroon">seq1</font> <a href="seq_1.html#K10" target="_self">-</a> <span class="p1">(<span class="default"><a href="seq_1.html#K17" target="_self">-</a> <font color="Maroon">seq2</font></span>)</span> = 
<font color="Maroon">seq1</font> <a href="seq_1.html#K9" target="_self">+</a> <span class="p1">(<span class="default"><a href="seq_1.html#K17" target="_self">-</a> <span class="p2">(<span class="default"><a href="seq_1.html#K17" target="_self">-</a> <font color="Maroon">seq2</font></span>)</span></span>)</span>
<b>by </b><i/>
<br/>.= 
<font color="Maroon">seq1</font> <a href="seq_1.html#K9" target="_self">+</a> <font color="Maroon">seq2</font>
<b>by </b><i/>
;<br/>


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