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Math Algebra Linear Algebra with Applications (9th Edition) (Featured Titles for Linear Algebra (Introductory))

Let A bean n × n matrix and let λ be an eigenvalue of A. Show that if B is any matrix that commutes with A, then the eigenspace N ( A − λ I ) is invariant under B.

Let A bean n × n matrix and let λ be an eigenvalue of A. Show that if B is any matrix that commutes with A, then the eigenspace N ( A − λ I ) is invariant under B.

Solution Summary: The author explains that if B is any matrix that commutes with A, then the eigenspace N(A-lambda I) is invariant under

Linear Algebra with Applications (9th Edition) (Featured Titles for Linear Algebra (Introductory))

Linear Algebra with Applications (9th Edition) (Featured Titles for Linear Algebra (Introductory))

9th Edition

ISBN: 9780321962218

Author: Steven J. Leon

Publisher: PEARSON

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Textbook Question

Chapter 6.1, Problem 25E

Let A bean n × n matrix and let λ be an eigenvalue of A. Show that if B is any matrix that commutes with A, then the eigenspace N ( A − λ I ) is invariant under B.

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Chapter 6.1, Problem 24E

Chapter 6.1, Problem 26E

Chapter 6 Solutions

Linear Algebra with Applications (9th Edition) (Featured Titles for Linear Algebra (Introductory))

Ch. 6.1 - Find the eigenvalues and the corresponding...Ch. 6.1 - Show that the eigenvalues of a triangular matrix...Ch. 6.1 - Let A be an nn matrix. Prove that A is singular if...Ch. 6.1 - Let A be a nonsingular matrix and let be an...Ch. 6.1 - Let A and B be nn matrices. Show that if none of...Ch. 6.1 - Let be an eigenvalue of A and let x be an...Ch. 6.1 - Let A bean nn matrix and let B=I2A+A2. Show that...Ch. 6.1 - An nn matrix A is said to be idempotent if A2=A....Ch. 6.1 - An nn matrix is said to be nilpotent if Ak=O for...Ch. 6.1 - Let A be an nn matrix and let B=AI for some scalar...

Ch. 6.1 - Let A be an nn matrix and let B=A+I. Is it...Ch. 6.1 - Show that A and AT have the same eigenvalues. Do...Ch. 6.1 - Show that the matrix A=( cos sin sin cos) will...Ch. 6.1 - Let A be a 22 matrix. If tr(A)=8 and det(A)=12,...Ch. 6.1 - Let A=(aij) be an nn matrix with eigenvalues...Ch. 6.1 - Prob. 16E Ch. 6.1 - Prob. 17E Ch. 6.1 - Let A be an nn matrix and let be an eigenvalue of...Ch. 6.1 - Prob. 19E Ch. 6.1 - Let =+bi and =c+di be complex scalars and let A...Ch. 6.1 - Let Q be an orthogonal matrix. Show that if is an...Ch. 6.1 - Let Q be an orthogonal matrix with an eigenvalue...Ch. 6.1 - Let Q be a 33 orthogonal matrix whose determinant...Ch. 6.1 - Let x1,...,xr be eigenvectors of an nn matrix A...Ch. 6.1 - Let A bean nn matrix and let be an eigenvalue of...Ch. 6.1 - Let B=S1AS and let x be an eigenvector of B...Ch. 6.1 - Let A be an nn matrix with an eigenvalue and let...Ch. 6.1 - Prob. 28E Ch. 6.1 - Let A be an nn matrix and let be a nonzero...Ch. 6.1 - Prob. 30E Ch. 6.1 - Let A be a matrix whose columns all add up to a...Ch. 6.1 - Let 1 and 2 be distinct eigenvalues of A. Let x be...Ch. 6.1 - Let A and B be nn matrices. Show that (a) If is a...Ch. 6.1 - Prove that there do not exist nn matrices A and B...Ch. 6.1 - Let p()=(1)n(nan1n1a1a0) be a polynomial of degree...Ch. 6.1 - The result given in Exercise 35(b) holds even if...Ch. 6.2 - Find the general solution of each of the following...Ch. 6.2 - Solve each of the following initial value...Ch. 6.2 - Given Y=c1e1tx1+c2e2tx2++cnentxn is the solution...Ch. 6.2 - Two tanks each contain 100 liters of a mixture....Ch. 6.2 - Prob. 5E Ch. 6.2 - Solve the initial value problem...Ch. 6.2 - In Application 2, assume that the solutions are of...Ch. 6.2 - Solve the the problem in Application 2, using the...Ch. 6.2 - Prob. 9E Ch. 6.2 - Three masses are connected by a series of springs...Ch. 6.2 - Transform the nth-order equation...Ch. 6.3 - In each of the following, factor the matrix A into...Ch. 6.3 - For each of the matrices in Exercise 1, use the...Ch. 6.3 - For each of the nonsingular matrices in Exercise...Ch. 6.3 - For each of the following, find a matrix B such...Ch. 6.3 - Let A be a nondefective nn matrix with...Ch. 6.3 - Let A be a diagonalizable matrix whose eigenvalues...Ch. 6.3 - Show that any 33 matrix of the form (a100a100b) is...Ch. 6.3 - For each of the following, find all possible...Ch. 6.3 - Let A be a 44 matrix and let be an eigenvalue of...Ch. 6.3 - Prob. 10E Ch. 6.3 - Let A be a nn matrix with real entries and let...Ch. 6.3 - Let A be an nn matrix with an eigenvalue of...Ch. 6.3 - Show that a nonzero nilpotent matrix is defective.Ch. 6.3 - Let A be a diagonalizable matrix and let X be the...Ch. 6.3 - It follows from Exercise 14 that for a...Ch. 6.3 - Prob. 16E Ch. 6.3 - Let x, y, be nonzero vectors in n,n2, and let...Ch. 6.3 - Let A be a diagonalizable nn matrix. Prove that if...Ch. 6.3 - Prob. 19E Ch. 6.3 - Let T be an upper triangular matrix with distinct...Ch. 6.3 - Each year, employees at a company are given the...Ch. 6.3 - The city of Mawtookit maintains a constant...Ch. 6.3 - Let A=( 1 2 1 3 1 5 1 4 1 3 2 5 1 4 1 3 2 5 ) be a...Ch. 6.3 - Prob. 24E Ch. 6.3 - Prob. 25E Ch. 6.3 - Consider a Web network consisting of only four...Ch. 6.3 - Prob. 27E Ch. 6.3 - The transition matrix in Example 5 has the...Ch. 6.3 - Let A be the PageRank transition matrix and let xk...Ch. 6.3 - Use the definition of the matrix exponential to...Ch. 6.3 - Compute eA for each of the following matrices: A=(...Ch. 6.3 - In each of the following, solve the initial value...Ch. 6.3 - Let X be an eigenvalue of an nn matrix A and let x...Ch. 6.3 - Show that eA is nonsingular for any diagonalizable...Ch. 6.3 - Let A be a diagonalizable matrix with...Ch. 6.4 - For each of the following pairs of vectors z and...Ch. 6.4 - Let z1=( 1+i 2 1i 2 ) and z2=( i 2 1 2 ) Show...Ch. 6.4 - Let {u1,u2} be an orthonormal basis for 2, and let...Ch. 6.4 - Which of the matrices that follow are Hermitian?...Ch. 6.4 - Find an orthogonal or unitary diagonalizing matrix...Ch. 6.4 - Prob. 6E Ch. 6.4 - Let A be an nn Hermitian matrix and let x be a...Ch. 6.4 - Let A be an Hermitian matrix and let B=iA. Show...Ch. 6.4 - Let A and C be matrices in mn and let Bnr. Prove...Ch. 6.4 - Prob. 10E Ch. 6.4 - Show that z,w=wHz defines an inner product on n.Ch. 6.4 - Let x, y, and z be vectors in n and let and be...Ch. 6.4 - Let {u1,...,un} be an orthonormal basis for a...Ch. 6.4 - Given that A=(40001i0 i1) find a matrix B such...Ch. 6.4 - Let U be a unitary matrix. Prove that U is normal....Ch. 6.4 - Let u be a unit vector in n and define U=I2uuH....Ch. 6.4 - Show that if a matrix U is both unitary and...Ch. 6.4 - Let A be a 22 matrix with Schur decomposition UTUH...Ch. 6.4 - Let A be a 55 matrix with real entries. Let A=QTQT...Ch. 6.4 - Let A be a nn matrix with Schur decomposition...Ch. 6.4 - Show that M=A+iB (where A and B are real matrices)...Ch. 6.4 - Prob. 22E Ch. 6.4 - Prob. 23E Ch. 6.4 - Prob. 24E Ch. 6.4 - Prob. 25E Ch. 6.4 - Let A be a Hermitian matrix with eigenvalues...Ch. 6.4 - Let A=(0110) Write A as a sum 1u1u1T+2u2u2T, where...Ch. 6.4 - Let A be a Hermitian matrix with eigenvalues 12n...Ch. 6.4 - Given Amm,Bnn,Cmn, the equation AXXB=C(3) is known...Ch. 6.5 - Show that A and AT have the same nonzero singular...Ch. 6.5 - Use the method of Example 1 to find the singular...Ch. 6.5 - For each of the matrices in Exercise 2: determine...Ch. 6.5 - Let A=( 28 20 14 19 102 21)=( 3 5 4 5 0 4 5 3 5...Ch. 6.5 - The matrix A=(254630630254) has singular value...Ch. 6.5 - Prove that if A is a symmetric matrix with...Ch. 6.5 - Let A be an mn matrix with singular value...Ch. 6.5 - Let A be an nn matrix. Show that ATA and AAT are...Ch. 6.5 - Let A be an nn matrix with singular values...Ch. 6.5 - Let A be an nn matrix with singular value...Ch. 6.5 - Show that if is a singular value of A then there...Ch. 6.5 - Let A be an mn matrix of rank n with singular...Ch. 6.5 - Prob. 13E Ch. 6.6 - Find the matrix associated with each of the...Ch. 6.6 - Reorder the eigenvalues in Example 2 so that 1=4...Ch. 6.6 - Prob. 3E Ch. 6.6 - Let 1 and 2 be the eigenvalues of A=(abbc) What...Ch. 6.6 - Prob. 5E Ch. 6.6 - Which of the matrices that follow are positive...Ch. 6.6 - For each of the following functions, determine...Ch. 6.6 - Show that if A is symmetric positive definite,...Ch. 6.6 - Prob. 9E Ch. 6.6 - Prob. 10E Ch. 6.6 - Let A be a symmetric nn matrix with eigenvalues...Ch. 6.6 - Prob. 12E Ch. 6.6 - Prob. 13E Ch. 6.6 - Let A be a symmetric positive definite nn matrix....Ch. 6.7 - For each of the following matrices, compute the...Ch. 6.7 - Prob. 2E Ch. 6.7 - Let A=(2 100 12 100 12 100 12) Compute the LU...Ch. 6.7 - For each of the following, factor the given matrix...Ch. 6.7 - Find the Cholesky decomposition LLT for each of...Ch. 6.7 - Prob. 6E Ch. 6.7 - Prove each of the following: If U is a unit upper...Ch. 6.7 - Prob. 8E Ch. 6.7 - Let A be a symmetric positive definite matrix with...Ch. 6.7 - Let A be an mn matrix with rank n. Show that the...Ch. 6.7 - Prob. 11E Ch. 6.7 - Let A be a symmetric positive definite matrix and...Ch. 6.7 - Prob. 13E Ch. 6.7 - Prob. 14E Ch. 6.7 - Prob. 15E Ch. 6.7 - Let A be an nn symmetric negative definite matrix....Ch. 6.7 - Prob. 17E Ch. 6.8 - Find the eigenvalues of each of the following...Ch. 6.8 - Prob. 2E Ch. 6.8 - Find the output vector x in the open version of...Ch. 6.8 - Consider the closed version of the Leontief...Ch. 6.8 - Prob. 5E Ch. 6.8 - Prob. 6E Ch. 6.8 - Which of the matrices that follow are reducible?...Ch. 6.8 - Prob. 8E Ch. 6.8 - Prob. 9E Ch. 6.8 - Prove that a 22 matrix A is reducible if and only...Ch. 6.8 - Prove the Forbenius theorem in the case where A is...Ch. 6.8 - Prob. 12E Ch. 6.8 - Let A be an nn positive stochastic matrix with...Ch. 6.8 - Would the results of parts (c) and (d) in Exercise...Ch. 6.8 - A management student received fellowship offers...Ch. 6 - The top matrix on the menu is the diagonal matrix...Ch. 6 - Prob. 2E Ch. 6 - Prob. 3E Ch. 6 - Prob. 4E Ch. 6 - Prob. 5E Ch. 6 - Prob. 6E Ch. 6 - Prob. 7E Ch. 6 - The last item on the eigshow menu will generate a...Ch. 6 - Prob. 9E Ch. 6 - Prob. 10E Ch. 6 - Prob. 11E Ch. 6 - Consider the matrices A=(5 33 5) and B=(5 335)...Ch. 6 - Prob. 13E Ch. 6 - Prob. 14E Ch. 6 - Prob. 15E Ch. 6 - Prob. 16E Ch. 6 - Prob. 17E Ch. 6 - Prob. 18E Ch. 6 - Prob. 19E Ch. 6 - Let A be a nonsingular 22 matrix with singular...Ch. 6 - Set A=[1,1;0.5,0.5] and use MATLAB to verify each...Ch. 6 - Prob. 22E Ch. 6 - Prob. 23E Ch. 6 - Prob. 24E Ch. 6 - Prob. 25E Ch. 6 - If A is an nn matrix whose eigenvalues are all...Ch. 6 - If A is nn matrix, then A and AT have the same...Ch. 6 - If A and B are similar matrices, then they have...Ch. 6 - If A and B are nn matrices with the same...Ch. 6 - If A has eigenvalues of multiplicity greater than...Ch. 6 - If A is a 44 matrix of rank 3 and =0 is an...Ch. 6 - If A is a 44 matrix of rank 1 and =0 is an...Ch. 6 - The rank of an nn matrix A is equal to the number...Ch. 6 - The rank of an mn matrix A is equal to the number...Ch. 6 - If A is Hermitian and c is a complex scalar, then...Ch. 6 - If an nn matrix A has Schur decomposition A=UTUH,...Ch. 6 - If A is normal, but not Hermitian, then A must...Ch. 6 - Prob. 13CTA Ch. 6 - Prob. 14CTA Ch. 6 - If A is symmetric, then eA is symmetric positive...Ch. 6 - Let A=(10011 112 2) Find the eigenvalues of A. For...Ch. 6 - Let A be a 44 matrix with real entries that has...Ch. 6 - Let A be a nonsingular nn matrix and let be an...Ch. 6 - Show that if A is a matrix of the form...Ch. 6 - Let A=(4222 10 102 10 14) Without computing the...Ch. 6 - Prob. 6CTB Ch. 6 - Prob. 7CTB Ch. 6 - Let A be a 44 real symmetric matrix with...Ch. 6 - Let {u1,u2} be an orthonormal basis for 2 and...Ch. 6 - Let A be a 55 nonsymmetric matrix with rank equal...Ch. 6 - Let A and B be nn matrices. If A is real and...Ch. 6 - Let A be a matrix whose singular value...

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