Let A be a mxn matrix that n > m (a) Explain why A = 0 has at least a non-trivial solution. %3D

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter3: Matrices
Section3.5: Subspaces, Basis, Dimension, And Rank
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Let A be a m x n matrix that n> m
(a) Explain why AZ = ở has at least a non-trivial solution.
(b) What is the size of AT A?
(c) Using your work the previous parts, show why AT A is not invertable.
Transcribed Image Text:Let A be a m x n matrix that n> m (a) Explain why AZ = ở has at least a non-trivial solution. (b) What is the size of AT A? (c) Using your work the previous parts, show why AT A is not invertable.
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