GATE | GATE CS 2011 | Question 40
The Eigen values of a triangular matrix are given by its diagonal entries. We can also calculate (or verify given answers) using characteristic equation obtained by |M – λI| = 0.
1-λ 2 3
0 4-λ 7 = 0
0 0 3-λ
(1-λ)(4-λ)(3-λ) = 0
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