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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Chapter 6.6, Problem 10E
To determine

Toprove: ATA is positive semidefinite, but not positive definite if A be a singular n×n matrix.

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Chapter 6.6, Problem 9E
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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. 16ECh. 6.1 - Prob. 17ECh. 6.1 - Let A be an nn matrix and let be an eigenvalue of...Ch. 6.1 - Prob. 19ECh. 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. 28ECh. 6.1 - Let A be an nn matrix and let be a nonzero...Ch. 6.1 - Prob. 30ECh. 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. 5ECh. 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. 9ECh. 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. 10ECh. 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. 16ECh. 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. 19ECh. 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. 24ECh. 6.3 - Prob. 25ECh. 6.3 - Consider a Web network consisting of only four...Ch. 6.3 - Prob. 27ECh. 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. 6ECh. 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. 10ECh. 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. 22ECh. 6.4 - Prob. 23ECh. 6.4 - Prob. 24ECh. 6.4 - Prob. 25ECh. 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. 13ECh. 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. 3ECh. 6.6 - Let 1 and 2 be the eigenvalues of A=(abbc) What...Ch. 6.6 - Prob. 5ECh. 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. 9ECh. 6.6 - Prob. 10ECh. 6.6 - Let A be a symmetric nn matrix with eigenvalues...Ch. 6.6 - Prob. 12ECh. 6.6 - Prob. 13ECh. 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. 2ECh. 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. 6ECh. 6.7 - Prove each of the following: If U is a unit upper...Ch. 6.7 - Prob. 8ECh. 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. 11ECh. 6.7 - Let A be a symmetric positive definite matrix and...Ch. 6.7 - Prob. 13ECh. 6.7 - Prob. 14ECh. 6.7 - Prob. 15ECh. 6.7 - Let A be an nn symmetric negative definite matrix....Ch. 6.7 - Prob. 17ECh. 6.8 - Find the eigenvalues of each of the following...Ch. 6.8 - Prob. 2ECh. 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. 5ECh. 6.8 - Prob. 6ECh. 6.8 - Which of the matrices that follow are reducible?...Ch. 6.8 - Prob. 8ECh. 6.8 - Prob. 9ECh. 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. 12ECh. 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. 2ECh. 6 - Prob. 3ECh. 6 - Prob. 4ECh. 6 - Prob. 5ECh. 6 - Prob. 6ECh. 6 - Prob. 7ECh. 6 - The last item on the eigshow menu will generate a...Ch. 6 - Prob. 9ECh. 6 - Prob. 10ECh. 6 - Prob. 11ECh. 6 - Consider the matrices A=(5 33 5) and B=(5 335)...Ch. 6 - Prob. 13ECh. 6 - Prob. 14ECh. 6 - Prob. 15ECh. 6 - Prob. 16ECh. 6 - Prob. 17ECh. 6 - Prob. 18ECh. 6 - Prob. 19ECh. 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. 22ECh. 6 - Prob. 23ECh. 6 - Prob. 24ECh. 6 - Prob. 25ECh. 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. 13CTACh. 6 - Prob. 14CTACh. 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. 6CTBCh. 6 - Prob. 7CTBCh. 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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