Splitting Infinite Series into Real and Imaginary Parts

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SUMMARY

The discussion confirms that an infinite series of complex terms, denoted as \(\sum a_n\), which converges but not absolutely, can indeed be separated into its real and imaginary components. Specifically, it states that \(\sum a_n = \sum x_n + i\sum y_n\) holds true under these conditions. The convergence of the series is established through the convergence of the sequence of its partial sums, which applies to both real and imaginary parts of the series.

PREREQUISITES
  • Understanding of complex series convergence
  • Knowledge of real and imaginary components of complex numbers
  • Familiarity with the concept of partial sums
  • Basic principles of infinite series
NEXT STEPS
  • Study the properties of complex series convergence
  • Explore the implications of absolute convergence in series
  • Learn about the relationship between partial sums and series convergence
  • Investigate examples of splitting complex series into real and imaginary parts
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Mathematicians, students studying complex analysis, and anyone interested in the properties of infinite series and their convergence behaviors.

Poopsilon
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I need a quick reminder that this is (hopefully) true:

Let \sum a_n 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?

\sum a_n = \sum x_n + i\sum y_n
 
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Poopsilon said:
I need a quick reminder that this is (hopefully) true:

Let \sum a_n 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?

\sum a_n = \sum x_n + i\sum y_n



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.

DonAntonio
 
Ok cool, thanks.
 

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