Let f(x) = xT Ax be a quadratic form with associated n X n symmetric matrix A. Let the eigenvalues of A be λ1 >= λ2>= ···>= λn  Then the following are true, subject to the constraint II x|| = 1: Prove The minimum value of f(x) is λn, and it occurs when x is a unit eigenvector corresponding to λn

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Let f(x) = xT Ax be a quadratic form with associated n X n symmetric matrix A. Let the eigenvalues of A be λ1 >= λ2>= ···>= λThen the following are true, subject to the constraint II x|| = 1: Prove The minimum value of f(x) is λn, and it occurs when x is a unit eigenvector corresponding to λn

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