Problem 1PP: Determine if A = [234234234] is invertible. Problem 2PP: Suppose that for a certain n n matrix A, statement (s) of the Invertible Matrix Theorem is not... Problem 3PP: Suppose that A and B are n n matrices and the equation ABx = 0 has a nontrivial solution. What can... Problem 1E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 2E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 3E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 4E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 5E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 6E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 7E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 8E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 9E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 10E: Unless otherwise specified, assume that all matrices in these exercises are n n. Determine which of... Problem 11E: In Exercises 11 and 12, the matrices are all n n. Each part of the exercises is an implication of... Problem 12E: In Exercises 11 and 12, the matrices are all n n. Each part of the exercises is an implication of... Problem 13E: An m n upper triangular matrix is one whose entries below the main diagonal are 0s (as in Exercise... Problem 14E: An m n lower triangular matrix is one whose entries above the main diagonal are 0s (as in Exercise... Problem 15E: Can a square matrix with two identical columns be invertible? Why or why not? Problem 16E: Is it possible for a 5 5 matrix to be invertible when its columns do not span 5? Why or why not? Problem 17E: If A is invertible, then the columns of A1 are linearly independent. Explain why. Problem 18E: If C is 6 6 and the equation Cx = v is consistent for every v in 6, is it possible that for some v,... Problem 19E: If the columns of a 7 7 matrix D are linearly independent, what can you say about solutions of Dx =... Problem 20E: If n n matrices E and F have the property that EF = I, then E and F commute. Explain why. Problem 21E: If the equation Gx = y has more than one solution for some y in n, can the columns of G span n? Why... Problem 22E: If the equation Hx = c is inconsistent for some c in n, what can you say about the equation Hx = 0?... Problem 23E: If an n n matrix K cannot be row reduced to In. what can you say about the columns of K? Why? Problem 24E: If L is n n and the equation Lx = 0 has the trivial solution, do the columns of L span n ? Why? Problem 25E: Verify the boxed statement preceding Example 1. Problem 26E: Explain why the columns of A2 span n whenever the columns of A are linearly independent. Problem 27E: Show that if AB is invertible, so is A. You cannot use Theorem 6(b), because you cannot assume that... Problem 28E: Show that if AB is invertible, so is B. Problem 29E: If A is an n n matrix and the equation Ax = b has more than one solution for some b, then the... Problem 30E: If A is an n n matrix and the transformation x Ax is one-to-one, what else can you say about this... Problem 31E: Suppose A is an n n matrix with the property that the equation Ax = b has at least one solution for... Problem 32E: Suppose A is an n n matrix with the property that the equation Ax = 0 has only the trivial... Problem 33E: In Exercises 33 and 34, T is a linear transformation from 2 into 2. Show that T is invertible and... Problem 34E: In Exercises 33 and 34, T is a linear transformation from 2 into 2. Show that T is invertible and... Problem 35E: Let T : n n be an invertible linear transformation. Explain why T is both one-to-one and onto n.... Problem 36E: Let T be a linear transformation that maps n onto n. Show that T1 exists and maps n onto n. Is T1... Problem 37E: Suppose T and U are linear transformations from n to n such that T(Ux) = x for all x in n. Is it... Problem 38E: Suppose a linear transformation T : n n has the property that T(u) = T(v) for some pair of distinct... Problem 39E: Let T : n n be an invertible linear transformation, and let S and U be functions from n into n such... Problem 40E: Suppose T and S satisfy the invertibility equations (1) and (2), where T is a linear transformation.... format_list_bulleted