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<b>let </b><font color="Maroon">c<sub>1</sub></font>, <font color="Maroon">c<sub>2</sub></font> be   <a href="seq_1.html#NM1">Real_Sequence</a>;<br/>



<b>thus </b><font color="Maroon">c<sub>1</sub></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">c<sub>2</sub></font></span>)</span> = 
<font color="Maroon">c<sub>1</sub></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">c<sub>2</sub></font></span>)</span></span>)</span>
<b>by </b><i><a class="ref" href="seq_1.html#T15" target="_self">Th15</a></i>
<br/>.= 
<font color="Maroon">c<sub>1</sub></font> <a href="seq_1.html#K9" target="_self">+</a> <font color="Maroon">c<sub>2</sub></font>
<b>by </b><i><a class="ref" href="seq_1.html#T36" target="_self">Th36</a></i>
;<br/>


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