Linear Algebra: A Modern Introduction
4th Edition
ISBN: 9781285463247
Author: David Poole
Publisher: Cengage Learning
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Textbook Question
Chapter 6.7, Problem 9EQ
In Exercises 1-12, find the solution of the
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1.2.19. Let and s be natural numbers. Let G be the simple graph with vertex set
Vo... V„−1 such that v; ↔ v; if and only if |ji| Є (r,s). Prove that S has exactly k
components, where k is the greatest common divisor of {n, r,s}.
Question 3
over a field K.
In this question, MË(K) denotes the set of n × n matrices
(a) Suppose that A Є Mn(K) is an invertible matrix. Is it always true that A is
equivalent to A-¹? Justify your answer.
(b) Let B be given by
8
B = 0 7 7
0 -7 7
Working over the field F2 with 2 elements, compute the rank of B as an element
of M2(F2).
(c) Let
1
C
-1 1
[4]
[6]
and consider C as an element of M3(Q). Determine the minimal polynomial
mc(x) and hence, or otherwise, show that C can not be diagonalised.
[7]
(d) Show that C in (c) considered as an element of M3(R) can be diagonalised. Write
down all the eigenvalues. Show your working.
[8]
R denotes the field of real numbers, Q denotes the field of rationals, and
Fp denotes the field of p elements given by integers modulo p. You may refer to general
results from lectures.
Question 1
For each non-negative integer m, let R[x]m denote the
vector space consisting of the polynomials in x with coefficients in R and of degree ≤ m.
x²+2, V3 = 5. Prove that (V1, V2, V3) is a linearly independent
(a) Let vi = x, V2 =
list in R[x] 3.
(b) Let V1, V2, V3 be as defined in (a). Find a vector v € R[×]3 such that (V1, V2, V3, V4)
is a basis of R[x] 3.
[8]
[6]
(c) Prove that the map ƒ from R[x] 2 to R[x]3 given by f(p(x)) = xp(x) — xp(0) is a
linear map.
[6]
(d) Write down the matrix for the map ƒ defined in (c) with respect to the basis
(2,2x + 1, x²) of R[x] 2 and the basis (1, x, x², x³) of R[x] 3.
[5]
Chapter 6 Solutions
Linear Algebra: A Modern Introduction
Ch. 6.1 - 13. Finish verifying that is a vector space (see...Ch. 6.1 - In Exercises 14-17, determine whether the given...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - Prob. 25EQCh. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...
Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - Prob. 35EQCh. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - Prob. 41EQCh. 6.1 - Prob. 42EQCh. 6.1 - In Exercises 24-45, use Theorem 6.2 to determine...Ch. 6.1 - Prob. 44EQCh. 6.3 - Prob. 18EQCh. 6.4 - In Exercises 1-12, determine whether T is a linear...Ch. 6.4 - In Exercises 1-12, determine whether T is a linear...Ch. 6.4 - In Exercises 1-12, determine whether T is a linear...Ch. 6.4 - In Exercises 1-12, determine whether T is a linear...Ch. 6.4 - In Exercises 1-12, determine whether T is a linear...Ch. 6.4 - Prob. 6EQCh. 6.4 - Prob. 7EQCh. 6.4 - In Exercises 1-12, determine whether T is a linear...Ch. 6.4 - Prob. 9EQCh. 6.4 - In Exercises 1-12, determine whether T is a linear...Ch. 6.4 - Prob. 11EQCh. 6.4 - Prob. 12EQCh. 6.5 -
35. Let T: V→ W be a linear transformation...Ch. 6.7 - In Exercises 1-12, find the solution of the...Ch. 6.7 - Prob. 2EQCh. 6.7 - In Exercises 1-12, find the solution of the...Ch. 6.7 - Prob. 4EQCh. 6.7 - Prob. 5EQCh. 6.7 - Prob. 6EQCh. 6.7 - Prob. 7EQCh. 6.7 - In Exercises 1-12, find the solution of the...Ch. 6.7 - In Exercises 1-12, find the solution of the...Ch. 6.7 - In Exercises 1-12, find the solution of the...Ch. 6.7 - In Exercises 1-12, find the solution of the...Ch. 6.7 - In Exercises 1-12, find the solution of the...
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- Question 4 (a) The following matrices represent linear maps on R² with respect to an orthonormal basis: = [1/√5 2/√5 [2/√5 -1/√5] " [1/√5 2/√5] A = B = [2/√5 1/√5] 1 C = D = = = [ 1/3/5 2/35] 1/√5 2/√5 -2/√5 1/√5' For each of the matrices A, B, C, D, state whether it represents a self-adjoint linear map, an orthogonal linear map, both, or neither. (b) For the quadratic form q(x, y, z) = y² + 2xy +2yz over R, write down a linear change of variables to u, v, w such that q in these terms is in canonical form for Sylvester's Law of Inertia. [6] [4]arrow_forwardpart b pleasearrow_forwardQuestion 5 (a) Let a, b, c, d, e, ƒ Є K where K is a field. Suppose that the determinant of the matrix a cl |df equals 3 and the determinant of determinant of the matrix a+3b cl d+3e f ГЪ e [ c ] equals 2. Compute the [5] (b) Calculate the adjugate Adj (A) of the 2 × 2 matrix [1 2 A = over R. (c) Working over the field F3 with 3 elements, use row and column operations to put the matrix [6] 0123] A = 3210 into canonical form for equivalence and write down the canonical form. What is the rank of A as a matrix over F3? 4arrow_forward
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