Let T = L(V) be a self-adjoint operator. Suppose λ = F, and € > 0. Suppose there exists v € V such that ||v|| = 1 and ||Tv – λv|| < €. Prove that T has an eigenvalue X' such that |\ — X′| < €. (2) (Hint: Suppose, by contradiction, every eigenvalue X' of T satisfies |\ − \'| ≥ €; writing v as a sum of eigenvectors, show that (2) cannot hold.)

Advanced Engineering Mathematics
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ISBN:9780470458365
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Chapter2: Second-order Linear Odes
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Let TE L(V) be a self-adjoint operator. Suppose λ E F, and € > 0.
Suppose there exists v € V such that ||v|| = 1 and
||Tv — Av|| < €.
Prove that T has an eigenvalue X' such that |\ − X'| < e.
(2)
(Hint: Suppose, by contradiction, every eigenvalue X' of T satisfies |\ - X'| ≥ €;
writing v as a sum of eigenvectors, show that (2) cannot hold.)
Transcribed Image Text:Let TE L(V) be a self-adjoint operator. Suppose λ E F, and € > 0. Suppose there exists v € V such that ||v|| = 1 and ||Tv — Av|| < €. Prove that T has an eigenvalue X' such that |\ − X'| < e. (2) (Hint: Suppose, by contradiction, every eigenvalue X' of T satisfies |\ - X'| ≥ €; writing v as a sum of eigenvectors, show that (2) cannot hold.)
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