c) If A and B are row equivalent, and if B and C are row equivalent, then A and C are row equivalent. d) If A is an n×n matrix that is not invertible, then the linear system Ax-0 has infinitely many solutions. e) If A is an nxn matrix that is not invertible, then the matrix obtained by interchanging two Fows of A cannot be invertible.]

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Part C d and e

Q1. (b) Determine whether the statement is true or false, and justify your answer.
(a) The product of two elementary matrices of the same size must be an elementary matrix.
(b) Every elementary matrix is invertible.
(c) If A and B are row equivalent, and if B and C are row equivalent, then A and C are row
equivalent.
(d) If A is an nxn matrix that is not invertible, then the linear system Ax=0 has infinitely many
solutions.
(e) If A is an nxn matrix that is not invertible, then the matrix obtained by interchanging two
rows of A cannot be invertible.
Transcribed Image Text:Q1. (b) Determine whether the statement is true or false, and justify your answer. (a) The product of two elementary matrices of the same size must be an elementary matrix. (b) Every elementary matrix is invertible. (c) If A and B are row equivalent, and if B and C are row equivalent, then A and C are row equivalent. (d) If A is an nxn matrix that is not invertible, then the linear system Ax=0 has infinitely many solutions. (e) If A is an nxn matrix that is not invertible, then the matrix obtained by interchanging two rows of A cannot be invertible.
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