3. Find the spectrum of the following operator A: ( (: A(x1,..., Tn,..) = (x1 + x2, x2 + x3, ..., Xn + Xn+1,...).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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3
Problems for elementary spectral theory
1. Let A : ( → ® be given by
A(x1, 12, ..., Tn, ...) =
T1,
Xn
2'3
4... 4
Is this operator invertible? If the answer is "yes", find the inverse.
2. Consider the following operator A: L2(0, 1) → L²(0, 1),
(2) fx = (x)f
Does A have eigenvalues? Find the spectrum of A.
3. Find the spectrum of the following operator A : (² → (²:
A(x1,., xn, ...) = (x1 + x2, x2 + x3, ..., Xn + Xn+1, …..).
Hint. Use the spectral mapping theorem.
4. Let A : e → ² be given by
A(x1,..., In, ...) =
3
I +u
Prove that o(A) = {0}.
Hint. Use Gelfand's theorem.
Transcribed Image Text:Problems for elementary spectral theory 1. Let A : ( → ® be given by A(x1, 12, ..., Tn, ...) = T1, Xn 2'3 4... 4 Is this operator invertible? If the answer is "yes", find the inverse. 2. Consider the following operator A: L2(0, 1) → L²(0, 1), (2) fx = (x)f Does A have eigenvalues? Find the spectrum of A. 3. Find the spectrum of the following operator A : (² → (²: A(x1,., xn, ...) = (x1 + x2, x2 + x3, ..., Xn + Xn+1, …..). Hint. Use the spectral mapping theorem. 4. Let A : e → ² be given by A(x1,..., In, ...) = 3 I +u Prove that o(A) = {0}. Hint. Use Gelfand's theorem.
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