Complex Analysis (Practice Exam)

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SUMMARY

The discussion centers on computing the 100th derivative of the function f(z) = 1/(1+i-sqrt(2)z) at z=0, specifically f(100)(0)/100!. The solution utilizes Cauchy's integral formula, ultimately leading to the result of -1/(1+i). Participants suggest rewriting the function in its series representation to identify the coefficient of the z^100 term for the calculation.

PREREQUISITES
  • Understanding of complex analysis concepts, particularly Cauchy's integral formula.
  • Familiarity with derivatives and their evaluation at specific points.
  • Knowledge of series representation of functions in complex analysis.
  • Experience with calculating coefficients in power series expansions.
NEXT STEPS
  • Study Cauchy's integral formula in detail to understand its applications in complex analysis.
  • Learn about power series expansions and how to derive coefficients from them.
  • Explore techniques for calculating higher-order derivatives of complex functions.
  • Practice problems involving singularities and their impact on function behavior in complex analysis.
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Students in complex analysis courses, educators preparing exam materials, and anyone seeking to deepen their understanding of derivatives and series in complex functions.

PieceOfPi
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Homework Statement



This question is in my exam review problem from my complex analysis class.
Compute f(100)(0)/100!, where f(z) = 1/(1+i-sqrt(2)z).

(f(100)(0) means the 100th derivative of f evaluated at 0.)

Homework Equations



Cauchy's integral formula might be helpful.

The answer to this question is -1/(1+i).

The Attempt at a Solution



I thought about using Cauchy's integral formula, but it seems like I need to rewrite f(z) so that I have singularity at 0... or maybe I'm completely missing out.

Thanks!
 
Physics news on Phys.org
Have you tried writing the function as it's series representation about 0? Then the calculation you are looking for would be the coefficient in front of the z^100 term.
 

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