Linear Operators: Spectral theory |
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Page 1130
... kernel K ( a , b ) , then the adjoint operator K * is represented by the kernel K ( b , a ) . Conversely , if K ( · , · ) is a kernel satisfying ( 1 ) , then ( 2 ) defines a Hilbert - Schmidt operator . To prove these assertions , let ...
... kernel K ( a , b ) , then the adjoint operator K * is represented by the kernel K ( b , a ) . Conversely , if K ( · , · ) is a kernel satisfying ( 1 ) , then ( 2 ) defines a Hilbert - Schmidt operator . To prove these assertions , let ...
Page 1590
... kernel for an operator of the second order on a compact interval is a kernel of the Hilbert - Schmidt type . As soon as the results of Hilbert and E. Schmidt on such an integral kernel became available , the idea of obtaining the ...
... kernel for an operator of the second order on a compact interval is a kernel of the Hilbert - Schmidt type . As soon as the results of Hilbert and E. Schmidt on such an integral kernel became available , the idea of obtaining the ...
Page 1624
... kernel of Volterra type : ( * ) f ( t , λ ) = cos t√λ + [ ' K1 ( t , s ) cos s√īds . Let us indicate briefly how the kernel K1 is obtained once the func- tions f ( t , λ ) are known . A formal differentiation gives the following ...
... kernel of Volterra type : ( * ) f ( t , λ ) = cos t√λ + [ ' K1 ( t , s ) cos s√īds . Let us indicate briefly how the kernel K1 is obtained once the func- tions f ( t , λ ) are known . A formal differentiation gives the following ...
Contents
SPECTRAL THEORY Self Adjoint Operators in Hilbert Space | 858 |
BAlgebras | 859 |
Commutative BAlgebras | 868 |
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Common terms and phrases
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 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 real numbers satisfies sequence solution spectral spectral theorem square-integrable subspace Suppose T₁ T₂ theory To(t topology tr(T unique unitary vanishes vector zero