Procedure to find Cauchy Integral

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SUMMARY

The discussion focuses on the application of the Cauchy Integral Formula and the Residue Theorem in evaluating contour integrals of functions that are not analytic at certain points. Specifically, it clarifies that when dealing with rational functions that have poles within the contour, there is no need to separate the numerator from the denominator prior to integration. The residue at the pole will inherently account for the effects of both the numerator and denominator during the evaluation process.

PREREQUISITES
  • Understanding of Cauchy Integral Formula
  • Familiarity with Residue Theorem
  • Knowledge of contour integration
  • Basic concepts of analytic functions
NEXT STEPS
  • Study the application of Cauchy Integral Formula in complex analysis
  • Learn how to compute residues for functions with poles
  • Explore examples of contour integrals involving rational functions
  • Investigate the implications of analytic and non-analytic points in complex functions
USEFUL FOR

Students and professionals in mathematics, particularly those studying complex analysis, as well as anyone involved in evaluating contour integrals and understanding the behavior of functions with singularities.

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Homework Statement



I have a question - just to check when we know the whole function is not analytic at some point of z. We can use cauchy integral formula of 2*pi*j*f(a) to find the answer.

In between; one of such method is to use Partial Fraction to break up the rational functions.
So do we have to take out the numerator (which is analytic before doing the Integral?).

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The Attempt at a Solution

 
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It's very hard to work out from what you say what your question is, I'm afraid!. If you are talking about using the residue theorem to evaluate a contour integral of a function that is basically a fraction with a pole at some point (within the contour), then the answer is that you don't need to take out the denominator of the fraction before evaluating the answer as its effect will just be included in the evaluation of the residue.
 

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