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Splitting Infinite Series into Real and Imaginary Parts

  1. Apr 8, 2012 #1
    I need a quick reminder that this is (hopefully) true:

    Let [itex]\sum a_n[/itex] be an infinite series of complex terms which converges but not absolutely. Then can we still break it up into its real and imaginary parts?

    [tex]\sum a_n = \sum x_n + i\sum y_n[/tex]
  2. jcsd
  3. Apr 8, 2012 #2

    Well, since a (complex, real or whatever, as long as we have a definite meaning for infinite sums) series converges iff the sequence of its partial sums converges finitely, and a complex seq. converges iff its real and imaginary parts converge, then...yes.

  4. Apr 8, 2012 #3
    Ok cool, thanks.
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