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Loewner's Theorem on Monotone Matrix Functions

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Loewner's Theorem on Monotone Matrix Functions/ by Barry Simon.
作者:	Simon, Barry.
面頁冊數:	XI, 459 p. 8 illus.online resource. :
Contained By:	Springer Nature eBook
標題:	Functions of real variables. -
電子資源:	https://doi.org/10.1007/978-3-030-22422-6
ISBN:	9783030224226

Loewner's Theorem on Monotone Matrix Functions
Simon, Barry.

Loewner's Theorem on Monotone Matrix Functions[electronic resource] /by Barry Simon. - 1st ed. 2019. - XI, 459 p. 8 illus.online resource. - Grundlehren der mathematischen Wissenschaften, A Series of Comprehensive Studies in Mathematics,3540072-7830 ;. - Grundlehren der mathematischen Wissenschaften, A Series of Comprehensive Studies in Mathematics,351.

Preface -- Part I. Tools -- 1. Introduction: The Statement of Loewner's Theorem -- 2. Some Generalities -- 3. The Herglotz Representation Theorems and the Easy Direction of Loewner's Theorem -- 4. Monotonicity of the Square Root -- 5. Loewner Matrices -- 6. Heinävaara's Integral Formula and the Dobsch–Donoghue Theorem -- 7. Mn+1 ¹ Mn -- 8. Heinävaara's Second Proof of the Dobsch–Donoghue Theorem -- 9. Convexity, I: The Theorem of Bendat–Kraus–Sherman–Uchiyama -- 10. Convexity, II: Concavity and Monotonicity -- 11. Convexity, III: Hansen–Jensen–Pedersen (HJP) Inequality -- 12. Convexity, IV: Bhatia–Hiai–Sano (BHS) Theorem -- 13. Convexity, V: Strongly Operator Convex Functions -- 14. 2 x 2 Matrices: The Donoghue and Hansen–Tomiyama Theorems -- 15. Quadratic Interpolation: The Foiaş–Lions Theorem -- Part II. Proofs of the Hard Direction -- 16. Pick Interpolation, I: The Basics -- 17. Pick Interpolation, II: Hilbert Space Proof -- 18. Pick Interpolation, III: Continued Fraction Proof -- 19. Pick Interpolation, IV: Commutant Lifting Proof -- 20. A Proof of Loewner's Theorem as a Degenerate Limit of Pick's Theorem -- 21. Rational Approximation and Orthogonal Polynomials -- 22. Divided Differences and Polynomial Approximation -- 23. Divided Differences and Multipoint Rational Interpolation -- 24. Pick Interpolation, V: Rational Interpolation Proof -- 25. Loewner's Theorem Via Rational Interpolation: Loewner's Proof -- 26. The Moment Problem and the Bendat–Sherman Proof -- 27. Hilbert Space Methods and the Korányi Proof -- 28. The Krein–Milman Theorem and Hansen's Variant of the Hansen–Pedersen Proof -- 29. Positive Functions and Sparr's Proof -- 30. Ameur's Proof using Quadratic Interpolation -- 31. One-Point Continued Fractions: The Wigner–von Neumann Proof -- 32. Multipoint Continued Fractions: A New Proof -- 33. Hardy Spaces and the Rosenblum–Rovnyak Proof -- 34. Mellin Transforms: Boutet de Monvel's Proof -- 35. Loewner's Theorem for General Open Sets -- Part III. Applications and Extensions -- 36. Operator Means, I: Basics and Examples -- 37. Operator Means, II: Kubo–Ando Theorem -- 38. Lieb Concavity and Lieb–Ruskai Strong Subadditivity Theorems, I: Basics -- 39. Lieb Concavity and Lieb–Ruskai Strong Subadditivity Theorems, II: Effros' Proof -- 40. Lieb Concavity and Lieb–Ruskai Strong Subadditivity Theorems, III: Ando's Proof -- 41. Lieb Concavity and Lieb–Ruskai Strong Subadditivity Theorems, IV: Aujla–Hansen–Uhlmann Proof -- 42. Unitarily Invariant Norms and Rearrangement -- 43. Unitarily Invariant Norm Inequalities -- Part IV. End Matter -- Appendix A. Boutet de Monvel's Note -- Appendix B. Pictures -- Appendix C. Symbol List -- Bibliography -- Author Index -- Subject Index.

This book provides an in depth discussion of Loewner’s theorem on the characterization of matrix monotone functions. The author refers to the book as a ‘love poem,’ one that highlights a unique mix of algebra and analysis and touches on numerous methods and results. The book details many different topics from analysis, operator theory and algebra, such as divided differences, convexity, positive definiteness, integral representations of function classes, Pick interpolation, rational approximation, orthogonal polynomials, continued fractions, and more. Most applications of Loewner’s theorem involve the easy half of the theorem. A great number of interesting techniques in analysis are the bases for a proof of the hard half. Centered on one theorem, eleven proofs are discussed, both for the study of their own approach to the proof and as a starting point for discussing a variety of tools in analysis. Historical background and inclusion of pictures of some of the main figures who have developed the subject, adds another depth of perspective. The presentation is suitable for detailed study, for quick review or reference to the various methods that are presented. The book is also suitable for independent study. The volume will be of interest to research mathematicians, physicists, and graduate students working in matrix theory and approximation, as well as to analysts and mathematical physicists.

ISBN: 9783030224226

Standard No.: 10.1007/978-3-030-22422-6doiSubjects--Topical Terms:

792248
Functions of real variables.

LC Class. No.: QA331.5

Dewey Class. No.: 515.8

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