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Bounded integral operators on L²spaces

Author: Paul R Halmos; V S Sunder
Publisher: Berlin ; New York : Springer-Verlag, 1978.
Series: Ergebnisse der Mathematik und ihrer Grenzgebiete, 96.
Edition/Format:   Print book : EnglishView all editions and formats
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Genre/Form: L-zwei-Räume
Additional Physical Format: Online version:
Halmos, Paul R. (Paul Richard), 1916-2006.
Bounded integral operators on L²spaces.
Berlin ; New York : Springer-Verlag, 1978
(OCoLC)625795389
Material Type: Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Paul R Halmos; V S Sunder
ISBN: 0387088946 9780387088945 3540088946 9783540088943
OCLC Number: 5677720
Description: xv, 134 pages ; 25 cm.
Contents: 1. Measure Spaces.- Example 1.1. Separable, not ?-finite.- Example 1.2. Finite, not separable.- 2. Kernels.- 3. Domains.- Example 3.1. Domain 0.- Example 3.2. Hilbert transform.- Problem 3.3. Closed domain.- Example 3.4. Dense domain.- Example 3.5. Dense domain.- Example 3.6. Non-closed kernel.- Example 3.7. Non-closed kernel.- Theorem 3.8. Carleman kernels.- Lemma 3.9. Dominated subsequences.- Theorem 3.10. Full domain.- Example 3.11. Everywhere defined kernels.- Problem 3.12. Closed domains and kernels.- 4. Boundedness.- Lemma 4.1. Square integrable kernels.- Example 4.2. Dyads.- Lemma 4.3. Rank 1.- Corollary 4.4. Finite rank.- Theorem 4.5. Hilbert-Schmidt operators.- Corollary 4.6. Compactness.- Corollary 4.7. Singular values.- 5. Examples.- Example 5.1. Inflated identity.- Theorem 5.2. Schur test.- Example 5.3. Abel kernel.- Example 5.4. Cesaro kernel.- Example 5.5. Hilbert-Hankel matrix.- Theorem 5.6. Toeplitz matrices.- Example 5.7. Hilbert-Toeplitz matrix.- Example 5.8. Discrete Fourier transform.- 6. Isomorphisms.- Theorem 6.1. Induced unitary operators.- Theorem 6.2. Transforms of kernels.- Corollary 6.3. Unitary equivalence.- Corollary 6.4. Preservation of structure.- Example 6.5. Projection on L2(II).- Example 6.6. Atomic spaces versus ?.- 7. Algebra.- Problem 7.1. Multipliability.- Example 7.2. Compact Fourier transform.- Theorem 7.3. Operators on atomic spaces.- Lemma 7.4. Integrable approximation.- Theorem 7.5. Conjugate transposes.- Corollary 7.6. Atomic domain.- Corollary 7.7. Matrices.- 8. Uniqueness.- Theorem 8.1. Uniqueness.- Problem 8.2. Determination.- Example 8.3. Non-measurable kernel.- Problem 8.4. Measurability.- Theorem 8.5. Identity operator.- Theorem 8.6. Multiplication operators.- 9. Tensors.- Theorem 9.1. Direct sums.- Corollary 9.2. Carleman kernels.- Theorem 9.3. Tensor products.- Problem 9.4. Bounded kernels.- Theorem 9.5. Tensor multiplicativity of Int.- Theorem 9.6. Tensors with dyads.- Example 9.7. Isometry on L2(II).- Example 9.8. Inflations as tensor products.- Theorem 9.9. Bounded matrices.- Corollary 9.10. Schur products.- Example 9.11. Schur products with dyads.- 10. Absolute Boundedness.- Example 10.1. Hilbert-Toeplitz matrix.- Example 10.2. Discrete Fourier transform.- Example 10.3. Direct sum matrix.- Example 10.4. Divisible spaces.- Theorem 10.5. Characterization.- Corollary 10.6. Adjoints.- Theorem 10.7. Products.- Theorem 10.8. Non-invertibility.- Theorem 10.9. Schur products.- Example 10.10. Unbounded Schur products.- Remark 10.11. Tensor quotients.- 11. Carleman Kernels.- Example 11.1. Absolutely bounded, not Carleman.- Theorem 11.2. Inclusion relations.- Example 11.3. Counterexamples.- Theorem 11.4. Strong boundedness.- Theorem 11.5. Carleman functions.- Theorem 11.6. Right ideal.- Corollary 11.7. Non-invertibility.- Problem 11.8. Right ideal.- Theorem 11.9. Co-boundedness.- Theorem 11.10. Hermitian kernels.- Theorem 11.11. Normal Carleman adjoints.- Problem 11.12. Normal integral adjoints.- Example 11.13. Non-Carleman integral adjoint.- 12. Compactness.- Lemma 12.1. Convolution kernels on L1.- Theorem 12.2. Convolution kernels on L2.- Corollary 12.3. Compactness.- Example 12.4. Non-integral, compact.- 13. Compactness.- Lemma 13.1. Large characteristic functions.- Lemma 13.2. Absolute continuity.- Example 13.3. Non-absolute continuity.- Lemma 13.4. Hille-Tamarkin kernels.- Example 13.5. Non-Hille-Tamarkin kernels.- Remark 13.6. Hille-Tamarkin operators.- Lemma 13.7. Integrable kernels.- Theorem 13.8. compactness.- Corollary 13.9. Hilbert-Schmidt approximation.- 14. Essential Spectrum.- Example 14.1. Tensor products and spectra.- Theorem 14.2. Atkinson's theorem.- Theorem 14.3. Normal operators.- Theorem 14.4. A and A*A.- Corollary 14.5. A and AA*.- Theorem 14.6. Orthonormal sequences, left.- Corollary 14.7. Orthonormal sequences, right.- Remark 14.8. Absolute boundedness and invertibility.- Remark 14.9. Non-emptiness.- Theorem 14.10. Normal Carleman operators.- Lemma 14.11. Nearly invariant subspaces.- Remark 14.12. Hilbert-Schmidt strengthening.- Theorem 14.13. Weyl-von Neumann theorem.- Problem 14.14. Normal generalization.- Problem 14.15. Quasidiagonal generalization.- 4. Boundedness.- Lemma 4.1. Square integrable kernels.- Example 4.2. Dyads.- Lemma 4.3. Rank 1.- Corollary 4.4. Finite rank.- Theorem 4.5. Hilbert-Schmidt operators.- Corollary 4.6. Compactness.- Corollary 4.7. Singular values.- 5. Examples.- Example 5.1. Inflated identity.- Theorem 5.2. Schur test.- Example 5.3. Abel kernel.- Example 5.4. Cesaro kernel.- Example 5.5. Hilbert-Hankel matrix.- Theorem 5.6. Toeplitz matrices.- Example 5.7. Hilbert-Toeplitz matrix.- Example 5.8. Discrete Fourier transform.- 6. Isomorphisms.- Theorem 6.1. Induced unitary operators.- Theorem 6.2. Transforms of kernels.- Corollary 6.3. Unitary equivalence.- Corollary 6.4. Preservation of structure.- Example 6.5. Projection on L2(II).- Example 6.6. Atomic spaces versus ?.- 7. Algebra.- Problem 7.1. Multipliability.- Example 7.2. Compact Fourier transform.- Theorem 7.3. Operators on atomic spaces.- Lemma 7.4. Integrable approximation.- Theorem 7.5. Conjugate transposes.- Corollary 7.6. Atomic domain.- Corollary 7.7. Matrices.- 8. Uniqueness.- Theorem 8.1. Uniqueness.- Problem 8.2. Determination.- Example 8.3. Non-measurable kernel.- Problem 8.4. Measurability.- Theorem 8.5. Identity operator.- Theorem 8.6. Multiplication operators.- 9. Tensors.- Theorem 9.1. Direct sums.- Corollary 9.2. Carleman kernels.- Theorem 9.3. Tensor products.- Problem 9.4. Bounded kernels.- Theorem 9.5. Tensor multiplicativity of Int.- Theorem 9.6. Tensors with dyads.- Example 9.7. Isometry on L2(II).- Example 9.8. Inflations as tensor products.- Theorem 9.9. Bounded matrices.- Corollary 9.10. Schur products.- Example 9.11. Schur products with dyads.- 10. Absolute Boundedness.- Example 10.1. Hilbert-Toeplitz matrix.- Example 10.2. Discrete Fourier transform.- Example 10.3. Direct sum matrix.- Example 10.4. Divisible spaces.- Theorem 10.5. Characterization.- Corollary 10.6. Adjoints.- Theorem 10.7. Products.- Theorem 10.8. Non-invertibility.- Theorem 10.9. Schur products.- Example 10.10. Unbounded Schur products.- Remark 10.11. Tensor quotients.- 11. Carleman Kernels.- Example 11.1. Absolutely bounded, not Carleman.- Theorem 11.2. Inclusion relations.- Example 11.3. Counterexamples.- Theorem 11.4. Strong boundedness.- Theorem 11.5. Carleman functions.- Theorem 11.6. Right ideal.- Corollary 11.7. Non-invertibility.- Problem 11.8. Right ideal.- Theorem 11.9. Co-boundedness.- Theorem 11.10. Hermitian kernels.- Theorem 11.11. Normal Carleman adjoints.- Problem 11.12. Normal integral adjoints.- Example 11.13. Non-Carleman integral adjoint.- 12. Compactness.- Lemma 12.1. Convolution kernels on L1.- Theorem 12.2. Convolution kernels on L2.- Corollary 12.3. Compactness.- Example 12.4. Non-integral, compact.- 13. Compactness.- Lemma 13.1. Large characteristic functions.- Lemma 13.2. Absolute continuity.- Example 13.3. Non-absolute continuity.- Lemma 13.4. Hille-Tamarkin kernels.- Example 13.5. Non-Hille-Tamarkin kernels.- Remark 13.6. Hille-Tamarkin operators.- Lemma 13.7. Integrable kernels.- Theorem 13.8. compactness.- Corollary 13.9. Hilbert-Schmidt approximation.- 14. Essential Spectrum.- Example 14.1. Tensor products and spectra.- Theorem 14.2. Atkinson's theorem.- Theorem 14.3. Normal operators.- Theorem 14.4. A and A*A.- Corollary 14.5. A and AA*.- Theorem 14.6. Orthonormal sequences, left.- Corollary 14.7. Orthonormal sequences, right.- Remark 14.8. Absolute boundedness and invertibility.- Remark 14.9. Non-emptiness.- Theorem 14.10. Normal Carleman operators.- Lemma 14.11. Nearly invariant subspaces.- Remark 14.12. Hilbert-Schmidt strengthening.- Theorem 14.13. Weyl-von Neumann theorem.- Problem 14.14. Normal generalization.- Problem 14.15. Quasidiagonal generalization.- 15. Characterization.- Theorem 15.1. Integral operator, essential spectrum.- Remark 15.2. Right versus left.- Corollary 15.3. Unitary transforms.- Lemma 15.4. Matrix inflations.- Remark 15.5. Partially atomic spaces.- Lemma 15.6. Perturbations of Hermitian operators.- Theorem 15.7. Carleman operator, essential spectrum.- Corollary 15.8. Carleman if and only if integral.- Example 15.9. Unilateral shift.- Example 15.10. Non-simultaneity of A and A*.- Theorem 15.11. Simultaneity of A and A*.- Corollary 15.12. Simultaneous integral representability.- Lemma 15.13. Large 0 direct summand.- Theorem 15.14. Simultaneous Carleman representability.- Corollary 15.15. Simultaneous Carleman if and only if integral.- Problem 15.16. Absolutely bounded operators.- Theorem 15.17. Essential non-invertibility of A*A+AA*.- Theorem 15.18. Absolutely bounded operators.- 16. Universality.- Theorem 16.1. Universal integral operators.- Remark 16.2. Universal Carleman operators.- Problem 16.3. Small unitary transforms.- Lemma 16.4. Operator norm.- Theorem 16.5. Universally absolutely bounded matrices.- 17. Recognition.- Remark 17.1. Pointwise domination.- Theorem 17.2. Carleman characterization.- Corollary 17.3. Hilbert-Schmidt characterization.- Problem 17.4. Integral characterization.- Theorem 17.5. Orthonormal Carleman characterization.- Problem 17.6. Orthonormal integral characterization.- Theorem 17.7. Null-sequence Carleman characterization.- Appendix A. Finiteness and Countability Conditions.- Appendix B. Pointwise Unbounded Bounded Kernels.- Theorem B1. Pointwise unbounded subkernels.- Corollary B2. Subrectangles.- Corollary B3. Square integrable kernels.- Problem B4. Unbounded subkernels.- Appendix C. Riemann-Lebesgue Lemma.- Notes.- References.
Series Title: Ergebnisse der Mathematik und ihrer Grenzgebiete, 96.
Responsibility: P.R. Halmos, V.S. Sunder.

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