Prove that the eigenvalues of an upper (or lower) triangular matrix are just the diagonal elements of the matrix.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.3: Eigenvalues And Eigenvectors Of N X N Matrices
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Prove that the eigenvalues of an upper (or lower) triangular matrix are just the diagonal elements of the matrix.

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 Let the upper triangular matrix be A and the lower triangular matrix be B.

To show that: The eigenvalues of an upper (or lower) triangular matrix are the diagonal elements of the matrix.

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