Radius of convergance complex power series

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SUMMARY

The discussion centers on the application of Theorem 3 (termwise differentiation) and Theorem 4 (termwise integration) in determining the radius of convergence for complex power series. The user initially struggled with the concepts of differentiation and integration in this context but ultimately found a solution after reevaluating the problem. The integration technique was particularly noted for its ability to simplify the expression by effectively canceling terms in the numerator.

PREREQUISITES
  • Understanding of complex power series
  • Familiarity with termwise differentiation
  • Knowledge of termwise integration
  • Basic calculus concepts related to integration and differentiation
NEXT STEPS
  • Study the proofs and applications of Theorem 3 and Theorem 4 in complex analysis
  • Explore examples of radius of convergence calculations for various power series
  • Learn about the implications of termwise differentiation and integration on series convergence
  • Investigate additional techniques for simplifying complex power series
USEFUL FOR

Students studying complex analysis, particularly those focusing on power series and their convergence properties, as well as educators seeking to clarify these concepts for their students.

Nikitin
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Homework Statement



https://scontent-a.xx.fbcdn.net/hphotos-ash3/1390611_10201748262844961_2141774184_n.jpg

I need help with 7b. Theorem 3 = termwise differentiation and theorem 4 = termwise integration.

Homework Equations


The Attempt at a Solution



I have no idea how differentiation or integration would help me. Can somebody post a short strategy I can use? Please?
 
Last edited:
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Termwise integration gives a term to "cancel" the n in the numerator (not exactly, however). That's not really necessary, but at least it uses integration.
 
Hey! I solved it after looking at the problem with a fresh mind. Thx for the comment, tho
 

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