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E-raamat: Fractional Cauchy Transforms [Taylor & Francis e-raamat]

(University of New Hampshire, Durham, USA), (Pemaquid, Maine, USA)
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Presenting new results along with research spanning five decades, Fractional Cauchy Transforms provides a full treatment of the topic, from its roots in classical complex analysis to its current state. Self-contained, it includes introductory material and classical results, such as those associated with complex-valued measures on the unit circle, that form the basis of the developments that follow. The authors focus on concrete analytic questions, with functional analysis providing the general framework.

After examining basic properties, the authors study integral means and relationships between the fractional Cauchy transforms and the Hardy and Dirichlet spaces. They then study radial and nontangential limits, followed by chapters devoted to multipliers, composition operators, and univalent functions. The final chapter gives an analytic characterization of the family of Cauchy transforms when considered as functions defined in the complement of the unit circle.

About the authors:

Rita A. Hibschweiler is a Professor in the Department of Mathematics and Statistics at the University of New Hampshire, Durham, USA.

Thomas H. MacGregor is Professor Emeritus, State University of New York at Albany and a Research Associate at Bowdoin College, Brunswick, Maine, USA.\
List of Symbols
ix
Preface xiii
Acknowledgements xvii
Introduction
Definition of the families fα
1(1)
Relations between fα and H1
2(2)
The Riesz-Herglotz formula
4(1)
Representations with real measures and h1
5(2)
The F. and M. Riesz theorem
7(2)
The representing measures for functions in fα
9(2)
The one-to-one correspondence between measures and functions in the Riesz-Herglotz formula
11(1)
The Banach space structure of fα
11(2)
Norm convergence and convergence uniform on compact sets
13(2)
Notes
15(2)
Basic Properties of fα
Properties of the gamma function and the binomial coefficients
17(5)
A product theorem
22(2)
Membership of f and f' in fα
24(2)
The inclusion of fα in fβ when 0 ≤ α < β
26(1)
The union of fα for α > 0
26(2)
Mappings from fα to fβ
28(1)
An integral condition for membership in fα when α > 1
29(1)
Besov spaces and their relationship to fα
30(4)
Infinite Blaschke products and membership in fα
34(4)
The inner function S and its membership in fα
38(3)
Hadamard products and relations with f1 and H∞
41(5)
Notes
46(1)
Integral Means and the Hardy and Dirichlet Spaces
Subordination
47(1)
Littlewood's inequality
48(1)
Estimates on integral means
49(3)
Relations between fα and Hp
52(3)
Growth of the integral means of f when f ε fα α > and 0 < p > 1
55(2)
The Dirichlet spaces and fα
57(3)
Inner functions and area
60(1)
Inner functions and f0
61(3)
Membership of inner functions in Dirichlet spaces, Besov spaces and fα
64(1)
Notes
65(3)
Radial Limits
Boundary functions and weak Lp inequalities
68(4)
Nontangential limits
72(1)
Radial limits and nontangential limits of bounded functions
73(2)
Local integrability conditions and radial limits
75(3)
α-capacity
78(3)
Nondecreasing functions and α-capacity
81(3)
Nontangential limits and exceptional sets of zero α-capacity
84(1)
Growth and countable exceptional sets
85(1)
Growth and exceptional sets of measure zero
86(4)
Notes
90(3)
Zeros
The moduli of the zeros of a function in fα when α > 1
93(2)
Zeros in a Stolz angle
95(4)
Functions with large growth when fα 1
99(5)
Functions with zeros tending slowly to T
104(2)
Notes
106(1)
Multipliers: Basic Results
The multiplication operator and the definition of Mα
107(3)
The Banach space structure of Mα
110(2)
The inclusion of Mα in Mβ when 0 > α < β
112(1)
Multipliers and H∞
113(2)
Nontangential limits
115(1)
Radial variations
115(6)
An assumption on integrability sufficient to imply a Lipschitz condition
121(6)
A sufficient condition for a multiplier when 0 < a < 1
127(3)
Notes
130(5)
Multipliers: Further Results
A lemma about Toeplitz operators and M1
135(4)
An integralbility condition on the second difference
139(5)
Smoothness conditions
144(1)
Conditions on the Taylor coefficients
when 0 < α < 1
145(2)
when α = 1
147(13)
when α > 1
160(1)
The condition f' ε H1
161(1)
Blaschke products
162(7)
The singular inner function S
169(12)
Strict monotonicity of multiplier spaces
181(1)
A survey of facts about M0
181(2)
Notes
183(3)
Composition
Composition with conformal automorphisms
186(1)
Factorization in the case of finitely many zeros
187(3)
Factorization with infinite Blaschke products when α = 1
190(2)
The extreme points of ρ
192(1)
A product theorem for subordination families
192(1)
The closed convex hull of subordination classes
193(1)
Composition operators when α ≥ 1
194(3)
Excluded rays and membership in &fα
197(2)
The hereditary property of composition operators for increasing α
199(1)
A Taylor series condition for a composition operator
200(2)
Notes
202(2)
Univalent Functions
The closed convex hull of starlike and of convex mappings
204(3)
Prawitz's inequality
207(1)
A sufficient condition for membership in f2
207(1)
Spirallike and close-to-convex mappings
208(2)
Univalent functions which do not belong to f2
210(2)
The maximum modulus and membership in fα
212(2)
Univalent self-maps of the disk and composition operators
214(2)
Notes
216(1)
A Characterization of Cauchy Transforms
The one-to-one mapping between measures and functions
217(5)
Necessary conditions for representation as a Cauchy transform
222(1)
The composition of a subharmonic function and an analytic function
223(2)
The subharmonicity of the special function up
225(2)
A key lemma for representation by a real measure
227(4)
Sufficient conditions for representation as a Cauchy transform
231(3)
Notes
234(3)
References 237(10)
Index 247


Rita A. Hibschweiler is a Professor in the Department of Mathematics and Statistics at the University of New Hampshire, Durham, USA., Thomas H. MacGregor is Professor Emeritus, State University of New York at Albany and a Research Associate at Bowdoin College. Brunswick, Maine, USA.