Complex Line Integral (not too hard)

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SUMMARY

The discussion centers on evaluating the complex line integral ∫dz/(z^4+1) over the curve C1(1+i). The integral can be factored into ∫dz/((z+1+i)(z+1-i)(z-1+i)(z-1-i)). Participants emphasize the importance of identifying the poles of the integrand and determining which poles lie within the specified curve. The application of Cauchy's integral formula is confirmed as the next step in solving the integral.

PREREQUISITES
  • Understanding of complex analysis concepts, specifically Cauchy's integral formula.
  • Familiarity with identifying poles of complex functions.
  • Knowledge of contour integration techniques.
  • Ability to factor polynomials in the complex plane.
NEXT STEPS
  • Study the application of Cauchy's integral formula in various contexts.
  • Learn how to identify and classify poles in complex functions.
  • Explore contour integration methods in complex analysis.
  • Practice solving complex integrals involving higher-degree polynomials.
USEFUL FOR

Students and professionals in mathematics, particularly those focusing on complex analysis, as well as anyone looking to enhance their skills in evaluating complex line integrals.

Jamin2112
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Homework Statement



∫dz/(z4+1) integrated over the curve C1(1+i)

Homework Equations



The only thing we learned in this chapter is Cauchy's integral formula, so I'm assuming that comes in somehow.

The Attempt at a Solution



∫dz/(z4+1) = ∫dz/(z+1+i)(z+1-i)(z-1+i)(z-1-i)

Not bad, eh? Where do I go from here.
 
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Look for the poles of your integrand (for which values of z is the denominator 0).
Now find out which of them lie inside of the curve.
Now apply Cauchy's formula.
 
susskind_leon said:
Look for the poles of your integrand (for which values of z is the denominator 0).
Now find out which of them lie inside of the curve.
Now apply Cauchy's formula.

Ah, I see now!
 

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