Complex Analysis : Residue Theory

Study concepts, example questions & explanations for Complex Analysis

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Example Questions

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例子问题# 1:Residue Theory

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Use Cauchy's Residue Theorem to evaluate the integral of

in the region.

Possible Answers:

Correct answer:

Explanation:

Note, for

a singularity exists where. Thus, since whereis the only singularity forinside, we seek to evaluate the residue for.

观察,

The coefficient ofis.

Thus,

.

Therefore, by Cauchy's Residue Theorem,

Hence,

例子问题# 1:Residue Theory

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Using Cauchy's Residue Theorem, evaluate the integral of

in the region

Possible Answers:

Correct answer:

Explanation:

Note, for

a singularity exists where. Thus, since whereis the only singularity forinside, we seek to evaluate the residue for.

观察,

The coefficient ofis.

Thus,

.

Therefore, by Cauchy's Residue Theorem,

Hence,

Example Question #42 :Complex Analysis

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Use Cauchy's Residue Theorem to evaluate the integral of

in the region.

Possible Answers:

Correct answer:

Explanation:

Note, there is one singularity forwhere.

Let

Then

so

.

Therefore, there is one singularity forwhere. Hence, we seek to compute the residue forwhere

观察,

So, when,.

Thus, the coefficient ofis.

Therefore,

Hence, by Cauchy's Residue Theorem,

Therefore,

例子问题# 1:Residue Theory

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

For the following problem, use a modified version of the theorem which goes as follows:

Residue Theorem

If a functionis analytic everywhere in the finite plane except for a finite number of singular points interior to a positively oriented simple closed contour, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Use the Residue Theorem to evaluate the integral of

in the region.

Possible Answers:

0

Correct answer:

0

Explanation:

Note,

Thus, seeking to apply the Residue Theorem above forinside, we evaluate the residue for.

观察,

The coefficient ofis.

Thus,

.

Therefore, by the Residue Theorem above,

Hence,

例子问题# 1:Residue Theory

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

For the following problem, use a modified version of the theorem which goes as follows:

Residue Theorem

If a functionis analytic everywhere in the finite plane except for a finite number of singular points interior to a positively oriented simple closed contour, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Use the Residue Theorem to evaluate the integral of

in the region.

Possible Answers:

Correct answer:

Explanation:

Note,

Thus, seeking to apply the Residue Theorem above forinside, we evaluate the residue for.

观察,

The coefficient ofis.

Thus,

.

Therefore, by the Residue Theorem above,

Hence,

例子问题# 1:Residue Theory

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

For the following problem, use a modified version of the theorem which goes as follows:

Residue Theorem

If a functionis analytic everywhere in the finite plane except for a finite number of singular points interior to a positively oriented simple closed contour, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Use the Residue Theorem to evaluate the integral of

in the region.

Possible Answers:

Correct answer:

Explanation:

Note,

Thus, seeking to apply the Residue Theorem above forinside, we evaluate the residue for.

观察,

The coefficient ofis.

Thus,

.

Therefore, by the Residue Theorem above,

Hence,

例子问题# 1:Residue Theory

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

For the following problem, use a modified version of the theorem which goes as follows:

Residue Theorem

If a functionis analytic everywhere in the finite plane except for a finite number of singular points interior to a positively oriented simple closed contour, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Use the Residue Theorem to evaluate the integral of

in the region.

Possible Answers:

Correct answer:

Explanation:

Note,

Thus, seeking to apply the Residue Theorem above forinside, we evaluate the residue for.

观察, the coefficient ofis.

Thus,

.

Therefore, by the Residue Theorem above,

Hence,

例子问题# 1:Residue Theory

Cauchy's Residue Theorem is as follows:

Letbe a simple closed contour, described positively. If a functionis analytic insideexcept for a finite number of singular pointsinside, then

For the following problem, use a modified version of the theorem which goes as follows:

Residue Theorem

If a functionis analytic everywhere in the finite plane except for a finite number of singular points interior to a positively oriented simple closed contour, then

Brown, J. W., & Churchill, R. V. (2009).Complex variables and applications. Boston, MA: McGraw-Hill Higher Education.

Use the Residue Theorem to evaluate the integral of

in the region.

Possible Answers:

Correct answer:

Explanation:

Note,

Thus, seeking to apply the Residue Theorem above forinside, we evaluate the residue for.

观察,

The coefficient ofis.

Thus,

.

Therefore, by the Residue Theorem above,

Hence,

例子问题# 1:Residue Theory

Find the residue of the function

.

Possible Answers:

Correct answer:

Explanation:

观察

The coefficient ofis.

Thus,

.

Example Question #2 :Residue Theory

Find the residue atof

.

Possible Answers:

Correct answer:

Explanation:

Let.

观察,

The coefficient ofissince there is noterm in the sum.

Thus,

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