A Transition to Advanced Mathematics
8th Edition
ISBN: 9781285463261
Author: Douglas Smith, Maurice Eggen, Richard St. Andre
Publisher: Cengage Learning
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Chapter 5.4, Problem 12E
Let
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5. (a) State the Residue Theorem. Your answer should include all the conditions required
for the theorem to hold.
(4 marks)
(b) Let y be the square contour with vertices at -3, -3i, 3 and 3i, described in the
anti-clockwise direction. Evaluate
に
dz.
You must check all of the conditions of any results that you use.
(5 marks)
(c) Evaluate
L
You must check all of the conditions of any results that you use.
ཙ
x sin(Tx)
x²+2x+5
da.
(11 marks)
3. (a) Lety: [a, b] C be a contour. Let L(y) denote the length of y. Give a formula
for L(y).
(1 mark)
(b) Let UCC be open. Let f: U→C be continuous. Let y: [a,b] → U be a
contour. Suppose there exists a finite real number M such that |f(z)| < M for
all z in the image of y. Prove that
<
||, f(z)dz| ≤ ML(y).
(3 marks)
(c) State and prove Liouville's theorem. You may use Cauchy's integral formula without
proof.
(d) Let R0. Let w € C. Let
(10 marks)
U = { z Є C : | z − w| < R} .
Let f UC be a holomorphic function such that
0 < |ƒ(w)| < |f(z)|
for all z Є U. Show, using the local maximum modulus principle, that f is constant.
(6 marks)
3. (a) Let A be an algebra. Define the notion of an A-module M. When is a module M
a simple module?
(b) State and prove Schur's Lemma for simple modules.
(c) Let AM(K) and M = K" the natural A-module.
(i) Show that M is a simple K-module.
(ii) Prove that if ƒ € Endд(M) then ƒ can be written as f(m) = am, where a
is a matrix in the centre of M, (K).
[Recall that the centre, Z(M,(K)) == {a Mn(K) | ab
M,,(K)}.]
= ba for all bЄ
(iii) Explain briefly why this means End₁(M) K, assuming that Z(M,,(K))~
K as K-algebras.
Is this consistent with Schur's lemma?
Chapter 5 Solutions
A Transition to Advanced Mathematics
Ch. 5.1 - The Cayley tables for operations o,*,+, and are...Ch. 5.1 - Prob. 2ECh. 5.1 - Prob. 3ECh. 5.1 - Prob. 4ECh. 5.1 - Give an example of an algebraic structure of order...Ch. 5.1 - Prob. 6ECh. 5.1 - Show that the structure ({1},), with operation ...Ch. 5.1 - (a)In the group G of Exercise 2, find x such that...Ch. 5.1 - Show that (,), with operation # defined by...Ch. 5.1 - Construct the operation table for each of the...
Ch. 5.1 - Prob. 11ECh. 5.1 - (a)Prove that (m,+) is associative and commutative...Ch. 5.1 - Suppose m and m2. Prove that 1 and m1 are distinct...Ch. 5.1 - Let m and a be natural numbers with am. Complete...Ch. 5.1 - Prob. 15ECh. 5.1 - Prob. 16ECh. 5.1 - Prob. 17ECh. 5.1 - Consider the set A={a,b,c,d} with operation ogiven...Ch. 5.1 - Repeat Exercise 2 with the operation * given by...Ch. 5.1 - Let m,n and M=A:A is an mn matrix with real number...Ch. 5.1 - Prob. 21ECh. 5.1 - Prob. 22ECh. 5.2 - Show that each of the following algebraic...Ch. 5.2 - Given that G={e,u,v,w} is a group of order 4 with...Ch. 5.2 - Prob. 3ECh. 5.2 - Give an example of an algebraic system (G,o) that...Ch. 5.2 - Construct the operation table for S2. Is S2...Ch. 5.2 - Prob. 6ECh. 5.2 - Let G be a group and aiG for all n. Prove that...Ch. 5.2 - Prove part (d) of Theorem 6.2.3. That is, prove...Ch. 5.2 - Prob. 9ECh. 5.2 - Prob. 10ECh. 5.2 - Prob. 11ECh. 5.2 - Assign a grade of A (correct), C (partially...Ch. 5.3 - Assign a grade of A (correct), C (partially...Ch. 5.3 - Find all subgroups of (8,+). (U11,). (5,+). (U7,)....Ch. 5.3 - In the group S4, find two different subgroups that...Ch. 5.3 - Prove that if G is a group and H is a subgroup of...Ch. 5.3 - Prove that if H and K are subgroups of a group G,...Ch. 5.3 - Let G be a group and H be a subgroup of G. If H is...Ch. 5.3 - Prob. 7ECh. 5.3 - Prob. 8ECh. 5.3 - Prob. 9ECh. 5.3 - List all generators of each cyclic group in...Ch. 5.3 - Prob. 11ECh. 5.3 - Let G be a group, and let H be a subgroup of G....Ch. 5.3 - Let ({0},) be the group of nonzero complex numbers...Ch. 5.3 - Prob. 14ECh. 5.3 - Prob. 15ECh. 5.3 - Let G=a be a cyclic group of order 30. What is the...Ch. 5.4 - Is S3 isomorphic to (6,+)? Explain.Ch. 5.4 - Prob. 2ECh. 5.4 - Use the method of proof of Cayley's Theorem to...Ch. 5.4 - Define f:++ by f(x)=x where + is the set of all...Ch. 5.4 - Assign a grade of A (correct), C (partially...Ch. 5.4 - Prob. 6ECh. 5.4 - Define on by setting (a,b)(c,d)=(acbd,ad+bc)....Ch. 5.4 - Let f the set of all real-valued integrable...Ch. 5.4 - Prob. 9ECh. 5.4 - Find the order of each element of the group S3....Ch. 5.4 - Prob. 11ECh. 5.4 - Let (3,+) and (6,+) be the groups in Exercise 10,...Ch. 5.4 - Prob. 13ECh. 5.4 - Prob. 14ECh. 5.4 - Prob. 15ECh. 5.4 - Prob. 16ECh. 5.4 - Prob. 17ECh. 5.5 - Prob. 1ECh. 5.5 - Prob. 2ECh. 5.5 - Show that any two groups of order 2 are...Ch. 5.5 - Show that the function h: defined by h(x)=3x is...Ch. 5.5 - Let R be the equivalence relation on ({0}) given...Ch. 5.5 - Prob. 6ECh. 5.5 - Prob. 7ECh. 5.5 - Let (R,+,) be an algebraic structure such that...Ch. 5.5 - Assign a grade of A (correct), C (partially...Ch. 5.5 - Let M be the set of all 22 matrices with real...
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