The Theory of H(b) Spaces: Volume 1 ( New Mathematical Monographs )

Publication series :New Mathematical Monographs

Author: Emmanuel Fricain; Javad Mashreghi  

Publisher: Cambridge University Press‎

Publication year: 2016

E-ISBN: 9781316056172

P-ISBN(Paperback): 9781107027770

Subject: O177.1 Hilbert space and linear operator theory

Keyword: 复分析、复变函数

Language: ENG

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The Theory of H(b) Spaces: Volume 1

Description

An H(b) space is defined as a collection of analytic functions which are in the image of an operator. The theory of H(b) spaces bridges two classical subjects: complex analysis and operator theory, which makes it both appealing and demanding. The first volume of this comprehensive treatment is devoted to the preliminary subjects required to understand the foundation of H(b) spaces, such as Hardy spaces, Fourier analysis, integral representation theorems, Carleson measures, Toeplitz and Hankel operators, various types of shift operators, and Clark measures. The second volume focuses on the central theory. Both books are accessible to graduate students as well as researchers: each volume contains numerous exercises and hints, and figures are included throughout to illustrate the theory. Together, these two volumes provide everything the reader needs to understand and appreciate this beautiful branch of mathematics.

Chapter

1.10 Invariant subspaces and cyclic vectors

1.11 Compressions and dilations

1.12 Angle between two subspaces

Notes on Chapter 1

2 Some families of operators

2.1 Finite-rank operators

2.2 Compact operators

2.3 Subdivisions of spectrum

2.4 Self-adjoint operators

2.5 Contractions

2.6 Normal and unitary operators

2.7 Forward and backward shift operators on ell[sup(2)]

2.8 The multiplication operator on L[sup(2)](μ)

2.9 Doubly infinite Toeplitz and Hankel matrices

Notes on Chapter 2

3 Harmonic functions on the open unit disk

3.1 Nontangential boundary values

3.2 Angular derivatives

3.3 Some well-known facts in measure theory

3.4 Boundary behavior of P(μ)

3.5 Integral means of P(μ)

3.6 Boundary behavior of Q(μ)

3.7 Integral means of Q(μ)

3.8 Subharmonic functions

3.9 Some applications of Green’s formula

Notes on Chapter 3

4 Hardy spaces

4.1 Hyperbolic geometry

4.2 Classic Hardy spaces H[sup(p)]

4.3 The Riesz projection P[sub(+)]

4.4 Kernels of P[sub(+)] and P[sub(-)]

4.5 Dual and predual of H[sup(p)] spaces

4.6 The canonical factorization

4.7 The Schwarz reflection principle for H[sup(1)] functions

4.8 Properties of outer functions

4.9 A uniqueness theorem

4.10 More on the norm in H[sup(p)]

Notes on Chapter 4

5 More function spaces

5.1 The Nevanlinna class mathcal N

5.2 The spectrum of b

5.3 The disk algebra mathcal A

5.4 The algebra mathcal C( mathbb T)+H[sup(∞)]

5.5 Generalized Hardy spaces H[sup(p)](nu)

5.6 Carleson measures

5.7 Equivalent norms on H[sup(2)]

5.8 The corona problem

Notes on Chapter 5

6 Extreme and exposed points

6.1 Extreme points

6.2 Extreme points of L[sup(p)](mathbb T)

6.3 Extreme points of H[sup(p)]

6.4 Strict convexity

6.5 Exposed points of mathfrak B( mathcal X)

6.6 Strongly exposed points of mathfrak B( mathcal X)

6.7 Equivalence of rigidity and exposed points in H[sup(1)]

6.8 Properties of rigid functions

6.9 Strongly exposed points of H[sup(1)]

Notes on Chapter 6

7 More advanced results in operator theory

7.1 The functional calculus for self-adjoint operators

7.2 The square root of a positive operator

7.3 Möbius transformations and the Julia operator

7.4 The Wold–Kolmogorov decomposition

7.5 Partial isometries and polar decomposition

7.6 Characterization of contractions on ell[sup(2)](mathbb Z)

7.7 Densely defined operators

7.8 Fredholm operators

7.9 Essential spectrum of block-diagonal operators

7.10 The dilation theory

7.11 The abstract commutant lifting theorem

Notes on Chapter 7

8 The shift operator

8.1 The bilateral forward shift operator Z[sub(μ)]

8.2 The unilateral forward shift operator S

8.3 Commutants of Z and S

8.4 Cyclic vectors of S

8.5 When do we have H[sup(p)](μ) = L[sup(p)](μ)?

8.6 The unilateral forward shift operator S[sub(μ)]

8.7 Reducing invariant subspaces of Z[sub(μ)]

8.8 Simply invariant subspaces of Z[sub(μ)]

8.9 Reducing invariant subspaces of S[sub(μ)]

8.10 Simply invariant subspaces of S[sub(μ)]

8.11 Cyclic vectors of Z[sub(μ)] and S[sup(*)]

Notes on Chapter 8

9 Analytic reproducing kernel Hilbert spaces

9.1 The reproducing kernel

9.2 Multipliers

9.3 The Banach algebra mathfrak Mult(mathcal H)

9.4 The weak kernel

9.5 The abstract forward shift operator S[sub(mathcal H)]

9.6 The commutant of S[sub(mathcal H)]

9.7 When do we have [mathfrac Mult( mathcal H)]=H[sup(∞)]?

9.8 Invariant subspaces of S[sub(mathcal H)]

Notes on Chapter 9

10 Bases in Banach spaces

10.1 Minimal sequences

10.2 Schauder basis

10.3 The multipliers of a sequence

10.4 Symmetric, nonsymmetric and unconditional basis

10.5 Riesz basis

10.6 The mappings J[sub(mathfrak X)], V[sub(mathfrac X)] and Γ[sub(mathfrac X)]

10.7 Characterization of the Riesz basis

10.8 Bessel sequences and the Feichtinger conjecture

10.9 Equivalence of Riesz and unconditional bases

10.10 Asymptotically orthonormal sequences

Notes on Chapter 10

11 Hankel operators

11.1 A matrix representation for H sub(varphi)

11.2 The norm of H[sub(varphi)]

11.3 Hilbert’s inequality

11.4 The Nehari problem

11.5 More approximation problems

11.6 Finite-rank Hankel operators

11.7 Compact Hankel operators

Notes on Chapter 11

12 Toeplitz operators

12.1 The operator T[sub(varphi)] in mathcal L(H[sub(2)])

12.2 Composition of two Toeplitz operators

12.3 The spectrum of T[sub(varphi)]

12.4 The kernel of T[sub(varphi])

12.5 When is T[sub(varphi)] compact?

12.6 Characterization of rigid functions

12.7 Toeplitz operators on H[sup(2)](μ)

12.8 The Riesz projection on L[sup(2)](μ)

12.9 Characterization of invertibility

12.10 Fredholm Toeplitz operators

12.11 Characterization of surjectivity

12.12 The operator X[sup(mathcal H)] and its invariant subspaces

Notes on Chapter 12

13 Cauchy transform and Clark measures

13.1 The space mathfrak K(mathbb D)

13.2 Boundary behavior of C[sub(μ)]

13.3 The mapping K[sub(μ)]

13.4 The operator K[sub(varphi)]: L[sup(2)](varphi) →H[sup(2)]

13.5 Functional calculus for S[sub(varphi)]

13.6 Toeplitz operators with symbols in L[sup(2)](mathbb T)

13.7 Clark measures μ[sub(α)]

13.8 The Cauchy transform of μ[sub(α)]

13.9 The function ρ

Notes on Chapter 13

14 Model subspaces K[sub(Θ)]

14.1 The arithmetic of inner functions

14.2 A generator for K[sub(Θ)]

14.3 The orthogonal projection P[sub(Θ)]

14.4 The conjugation Ω[sub(Θ)]

14.5 Minimal sequences of reproducing kernels in K[sub(B)]

14.6 The operators J and M[sub(Θ)]

14.7 Functional calculus for M[sub(Θ)]

14.8 Spectrum of M[sub(Θ)] and varphi(M[sub(Θ)])

14.9 The commutant lifting theorem for M[sub(Θ)]

14.10 Multipliers of K[sub(Θ)]

Notes on Chapter 14

15 Bases of reproducing kernels and interpolation

15.1 Uniform minimality of (k[sub(λn)])[sub(n≥1)]

15.2 The Carleson–Newman condition

15.3 Riesz basis of reproducing kernels

15.4 Nevanlinna–Pick interpolation problem

15.5 H[sup(∞)]-interpolating sequences

15.6 H[sup(2)]-interpolating sequences

15.7 Asymptotically orthonormal sequences

Notes on Chapter 15

References

Symbol index

Author index

Subject index

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