Elementary Differential Equations
10th Edition
ISBN: 9780470458327
Author: William E. Boyce, Richard C. DiPrima
Publisher: Wiley, John & Sons, Incorporated
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Chapter 4.3, Problem 18P
To determine
The suitable form for
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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?
(a) State, without proof, Cauchy's theorem, Cauchy's integral formula and Cauchy's
integral formula for derivatives. Your answer should include all the conditions
required for the results to hold.
(8 marks)
(b) Let U{z EC: |z| -1}. Let 12 be the triangular contour with vertices at
0, 2-2 and 2+2i, parametrized in the anticlockwise direction. Calculate
dz.
You must check the conditions of any results you use.
(d) Let U C. Calculate
Liz-1ym dz,
(z - 1) 10
(5 marks)
where 2 is the same as the previous part. You must check the conditions of any
results you use.
(4 marks)
(a) Suppose a function f: C→C has an isolated singularity at wЄ C. State what it
means for this singularity to be a pole of order k.
(2 marks)
(b) Let f have a pole of order k at wЄ C. Prove that the residue of f at w is given
by
1
res (f, w):
=
Z
dk
(k-1)! >wdzk−1
lim
-
[(z — w)* f(z)] .
(5 marks)
(c) Using the previous part, find the singularity of the function
9(z) =
COS(πZ)
e² (z - 1)²'
classify it and calculate its residue.
(5 marks)
(d) Let g(x)=sin(211). Find the residue of g at z = 1.
(3 marks)
(e) Classify the singularity of
cot(z)
h(z) =
Z
at the origin.
(5 marks)
Chapter 4 Solutions
Elementary Differential Equations
Ch. 4.1 - In each of Problems 1 through 6, determine...Ch. 4.1 - In each of Problems 1 through 6, determine...Ch. 4.1 - In each of Problems 1 through 6, determine...Ch. 4.1 - In each of Problems 1 through 6, determine...Ch. 4.1 - In each of Problems 1 through 6, determine...Ch. 4.1 - Prob. 6PCh. 4.1 - In each of Problems 7 through 10, determine...Ch. 4.1 - Prob. 8PCh. 4.1 - In each of Problems 7 through 10, determine...Ch. 4.1 - Prob. 10P
Ch. 4.1 - In each of Problems 11 through 16, verify that the...Ch. 4.1 - In each of Problems 11 through 16, verify that the...Ch. 4.1 - In each of Problems 11 through 16, verify that the...Ch. 4.1 - In each of Problems 11 through 16, verify that the...Ch. 4.1 - In each of Problems 11 through 16, verify that the...Ch. 4.1 - In each of Problems 11 through 16, verify that the...Ch. 4.1 - Prob. 17PCh. 4.1 - Prob. 18PCh. 4.1 - Prob. 19PCh. 4.1 - Prob. 20PCh. 4.1 - Prob. 21PCh. 4.1 - Prob. 22PCh. 4.1 - Prob. 23PCh. 4.1 - Prob. 24PCh. 4.1 - Prob. 25PCh. 4.1 - Prob. 26PCh. 4.1 - Prob. 27PCh. 4.1 - Prob. 28PCh. 4.2 - In each of Problems 1 through 6, express the given...Ch. 4.2 - In each of Problems 1 through 6, express the given...Ch. 4.2 - In each of Problems 1 through 6, express the given...Ch. 4.2 - In each of Problems 1 through 6, express the given...Ch. 4.2 - In each of Problems 1 through 6, express the given...Ch. 4.2 - In each of Problems 1 through 6, express the given...Ch. 4.2 - Prob. 7PCh. 4.2 - Prob. 8PCh. 4.2 - Prob. 9PCh. 4.2 - Prob. 10PCh. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - Prob. 15PCh. 4.2 - Prob. 16PCh. 4.2 - Prob. 17PCh. 4.2 - Prob. 18PCh. 4.2 - Prob. 19PCh. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 11 through 28, find the...Ch. 4.2 - In each of Problems 29 through 36, find the...Ch. 4.2 - Prob. 31PCh. 4.2 - Prob. 32PCh. 4.2 - Prob. 33PCh. 4.2 - Prob. 34PCh. 4.2 - Prob. 35PCh. 4.2 - Prob. 36PCh. 4.2 - Prob. 37PCh. 4.2 - Prob. 38PCh. 4.2 - Prob. 39PCh. 4.2 - Prob. 40PCh. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 1 through 8, determine the...Ch. 4.3 - In each of Problems 9 through 12, find the...Ch. 4.3 - In each of Problems 9 through 12, find the...Ch. 4.3 - In each of Problems 9 through 12, find the...Ch. 4.3 - In each of Problems 9 through 12, find the...Ch. 4.3 - In each of Problems 13 through 18, determine a...Ch. 4.3 - In each of Problems 13 through 18, determine a...Ch. 4.3 - In each of Problems 13 through 18, determine a...Ch. 4.3 - In each of Problems 13 through 18, determine a...Ch. 4.3 - In each of Problems 13 through 18, determine a...Ch. 4.3 - In each of Problems 13 through 18, determine a...Ch. 4.3 - Prob. 19PCh. 4.3 - Show that linear differential operators with...Ch. 4.4 - Prob. 1PCh. 4.4 - In each of Problems 1 through 6, use the method of...Ch. 4.4 - In each of Problems 1 through 6, use the method of...Ch. 4.4 - In each of Problems 1 through 6, use the method of...Ch. 4.4 - In each of Problems 1 through 6, use the method of...Ch. 4.4 - In each of Problems 1 through 6, use the method of...Ch. 4.4 - In each of Problems 7 and 8, find the general...Ch. 4.4 - In each of Problems 7 and 8, find the general...Ch. 4.4 - In each of Problems 9 through 12, find the...Ch. 4.4 - In each of Problems 9 through 12, find the...Ch. 4.4 - In each of Problems 9 through 12, find the...Ch. 4.4 - In each of Problems 9 through 12, find the...Ch. 4.4 - Given that x, x2, and 1/x are solutions of the...Ch. 4.4 - Find a formula involving integrals for a...Ch. 4.4 - Find a formula involving integrals for a...Ch. 4.4 - Find a formula involving integrals for a...Ch. 4.4 - Find a formula involving integrals for a...
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- = 1. Show (a) Let G = Z/nZ be a cyclic group, so G = {1, 9, 92,...,g" } with g": that the group algebra KG has a presentation KG = K(X)/(X” — 1). (b) Let A = K[X] be the algebra of polynomials in X. Let V be the A-module with vector space K2 and where the action of X is given by the matrix Compute End(V) in the cases (i) x = p, (ii) xμl. (67) · (c) If M and N are submodules of a module L, prove that there is an isomorphism M/MON (M+N)/N. (The Second Isomorphism Theorem for modules.) You may assume that MON is a submodule of M, M + N is a submodule of L and the First Isomorphism Theorem for modules.arrow_forward(a) Define the notion of an ideal I in an algebra A. Define the product on the quotient algebra A/I, and show that it is well-defined. (b) If I is an ideal in A and S is a subalgebra of A, show that S + I is a subalgebra of A and that SnI is an ideal in S. (c) Let A be the subset of M3 (K) given by matrices of the form a b 0 a 0 00 d Show that A is a subalgebra of M3(K). Ꮖ Compute the ideal I of A generated by the element and show that A/I K as algebras, where 0 1 0 x = 0 0 0 001arrow_forward(a) Let HI be the algebra of quaternions. Write out the multiplication table for 1, i, j, k. Define the notion of a pure quaternion, and the absolute value of a quaternion. Show that if p is a pure quaternion, then p² = -|p|². (b) Define the notion of an (associative) algebra. (c) Let A be a vector space with basis 1, a, b. Which (if any) of the following rules turn A into an algebra? (You may assume that 1 is a unit.) (i) a² = a, b²=ab = ba 0. (ii) a² (iii) a² = b, b² = abba = 0. = b, b² = b, ab = ba = 0. (d) Let u1, 2 and 3 be in the Temperley-Lieb algebra TL4(8). ገ 12 13 Compute (u3+ Augu2)² where A EK and hence find a non-zero x € TL4 (8) such that ² = 0.arrow_forward
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