13. a) Show that if A and B are n x n matrices, at least one of which is invertible, then AB and BA are similar. b) What do the matrices A = and B = %3D have to do with this issue?

Linear Algebra: A Modern Introduction
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ISBN:9781285463247
Author:David Poole
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Chapter5: Orthogonality
Section5.5: Applications
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13. a) Show that if A and B arenxn matrices, at least one of which is
invertible, then AB and BA are similar.
b) What do the matrices
and B- : ]
A
have to do with this issue?
c) Show that even without the assumption on invertibility the matrices
AB and BA have the same characteristic polynomial. Hint: Write
A = PIQ
where P and Q are invertible and I, is an n x n matrix that has the
rxr identity in the upper left-hand corner and 0's elsewhere. Write
B' = QBP. Compute AB and BA and find their characteristic
polynomials.
Transcribed Image Text:13. a) Show that if A and B arenxn matrices, at least one of which is invertible, then AB and BA are similar. b) What do the matrices and B- : ] A have to do with this issue? c) Show that even without the assumption on invertibility the matrices AB and BA have the same characteristic polynomial. Hint: Write A = PIQ where P and Q are invertible and I, is an n x n matrix that has the rxr identity in the upper left-hand corner and 0's elsewhere. Write B' = QBP. Compute AB and BA and find their characteristic polynomials.
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