Suppose that A is an n x n matrix such that A² = 0. a) Show that if 7 E im(A), then 7 € null(A). (In other words, show that im(A) C null(A).) b) Is it necessary that if 7 € null(A) then 7 € im(A)? (Either provide a proof, or show that this is not necessary.)

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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Suppose that A is an n x n matrix such that A² = 0.
a) Show that if ʊ € im(A), then ở € null(A). (In other words, show that im(A) ≤ null(A).)
b) Is it necessary that if √ € null(A) then ở € im(A)? (Either provide a proof, or show that this is not necessary.)
Transcribed Image Text:Suppose that A is an n x n matrix such that A² = 0. a) Show that if ʊ € im(A), then ở € null(A). (In other words, show that im(A) ≤ null(A).) b) Is it necessary that if √ € null(A) then ở € im(A)? (Either provide a proof, or show that this is not necessary.)
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