Linear Operators: Spectral theory |
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Page 1279
... interval of the real axis . The interval I can be open , half - open , or closed . The interval [ a , ∞ ) is considered to be half - open ; the interval ( —∞ , ∞ ) to be open . Thus a closed interval is a compact set . An end point t ...
... interval of the real axis . The interval I can be open , half - open , or closed . The interval [ a , ∞ ) is considered to be half - open ; the interval ( —∞ , ∞ ) to be open . Thus a closed interval is a compact set . An end point t ...
Page 1597
... interval [ a , ∞ ) , suppose that lim q ( t ) = C. t - b Then the essential spectrum of 7 is the semi - axis [ c , ∞ ) ( 7.16 ) . ( 20 ) In the interval [ 0 , ∞ ) , suppose that the function q ( t ) —c is of class L , [ 0 , ∞ ) for ...
... interval [ a , ∞ ) , suppose that lim q ( t ) = C. t - b Then the essential spectrum of 7 is the semi - axis [ c , ∞ ) ( 7.16 ) . ( 20 ) In the interval [ 0 , ∞ ) , suppose that the function q ( t ) —c is of class L , [ 0 , ∞ ) for ...
Page 1599
... interval [ 0 , ∞ ) . Then on the positive real axis every interval of length K contains a point of the essential spectrum of 7 ( Glazman [ 4 ] , Exercise 9.A 6 ) . τ ( 32 ) On the interval [ 0 , ∞ ) , if q ( t ) tends monotonically to ...
... interval [ 0 , ∞ ) . Then on the positive real axis every interval of length K contains a point of the essential spectrum of 7 ( Glazman [ 4 ] , Exercise 9.A 6 ) . τ ( 32 ) On the interval [ 0 , ∞ ) , if q ( t ) tends monotonically to ...
Contents
BAlgebras | 859 |
Commutative BAlgebras | 868 |
Commutative BAlgebras | 874 |
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adjoint extension adjoint operator algebra analytic B-algebra Borel set boundary conditions boundary values bounded operator C₁ closed closure coefficients compact operator complex numbers continuous function converges Corollary deficiency indices Definition denote dense eigenvalues element equation essential spectrum Exercise exists finite dimensional follows from Lemma follows from Theorem follows immediately formal differential operator formally self adjoint formula Fourier function defined function f Hence Hilbert space Hilbert-Schmidt operator identity inequality integral interval isometric isomorphism kernel L₁ L₁(R L₂(I L₂(R Lemma Let f linear linearly independent mapping matrix measure neighborhood non-zero norm open set operators in Hilbert orthogonal orthonormal basis Plancherel's theorem positive preceding lemma PROOF prove real axis satisfies sequence solution spectral spectral theorem square-integrable subset subspace Suppose T₁ T₁(t T₂ theory To(t topology tr(T unique unitary vanishes vector zero