Residue Calculus: Evaluating Poles and Contours

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    Calculus Residue
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SUMMARY

The discussion centers on evaluating poles and contours using the residue theorem in complex analysis. The identified poles are at z = ±2 and z = -1, with the latter being of order 4. The participants confirm that for contour (i), no residues lie within the contour, while for contour (iii), the poles at z = -1 and z = 2 are included. The importance of visualizing contours through graphing is emphasized as a method to determine the inclusion of poles.

PREREQUISITES
  • Understanding of complex analysis concepts, specifically poles and residues.
  • Familiarity with the residue theorem and its applications.
  • Ability to graph complex functions and contours in the complex plane.
  • Knowledge of the order of poles and their significance in residue calculations.
NEXT STEPS
  • Study the residue theorem in detail, focusing on its application in evaluating integrals.
  • Learn how to graph complex functions and identify poles and contours visually.
  • Explore examples of contour integration involving multiple poles and varying orders.
  • Investigate the implications of pole order on residue calculations and contour selection.
USEFUL FOR

Students and professionals in mathematics, particularly those studying complex analysis, as well as educators teaching residue calculus and contour integration techniques.

eeuler
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Homework Statement


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The Attempt at a Solution


So there are poles at: z=\pm2 and at z= -1 of order 4. Right?

My query is, when evaluating these poles (using the residue theorem), is it right that for (i) Z = 1/2, no residues lie in that contour?
for (iii), do all residues lie in the contour?
 
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Right about the poles, but for the rest, are you just guessing? Why don't you draw a graph? No, I don't think the triangle in iii) includes all poles.
 
^^I wasn't sure how to determine whether a pole is inside a specified contour but my tutor suggested drawing a graph, which i have been doing, in which case shouldn't (i) have no poles in the contour? As for (iii) then, would Z=+2, and Z=-1 lie in the contour?
 
Your tutor is wise. Yes, i) contains no poles and iii) contains z=(-1) and z=2.
 
^^Thanks :)
 

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