Title page for ETD etd-06192009-142044


Type of Document Dissertation
Author Vindas, Jasson
URN etd-06192009-142044
Title Local Behavior of Distributions and Applications
Degree Doctor of Philosophy (Ph.D.)
Department Mathematics
Advisory Committee
Advisor Name Title
Ricardo Estrada Committee Chair
Frank Neubrander Committee Member
Mark Davidson Committee Member
Robert Perlis Committee Member
William Adkins Committee Member
Shuangqing Wei Dean's Representative
Keywords
  • Schwartz distributions
  • Fourier transform
  • wavelets
  • jumps and Fourier series
  • tauberian theorems
  • generalized asymptotics
  • Abel and Cesaro summability
  • regular variation and slowly varying functions
  • Radon measures
  • Laplace transform
  • integral transforms
  • spaces of test functions
Date of Defense 2009-04-23
Availability unrestricted
Abstract
This dissertation studies local and asymptotic properties of distributions (generalized functions) in connection to several problems in harmonic analysis, approximation theory, classical real and

complex function theory, tauberian theory,

summability of divergent series and integrals, and number theory.

In Chapter 2 we give two new proofs of the Prime Number Theory based on ideas from asymptotic analysis on spaces of distributions. Several inverse problems in Fourier analysis and summability theory are studied in detail. Chapter 3 provides a complete characterization of point values of tempered distributions and functions in terms of a generalized pointwise Fourier inversion formula. The relation of the Fourier inversion formula with several summability procedures for divergent series and integrals is established. This work also provides formulas for jump singularities, that is, detection of edges from spectral data, which can be used as effective numerical detectors. Chapters 5 and 6 introduce new summability methods for the determination of jump discontinuities. Estimations on orders of summability are given in Chapter 8.

Chapters 4 and 9 give a tauberian theory for distributional point values; this theory recovers important classical tauberians of Hardy and Littlewood, among others, for Dirichlet series.

We make a complete wavelet analysis of asymptotic properties of distributions in Chapter 11. This study connects the boundary asymptotic behavior of the wavelet transform with asymptotics of tempered distributions. It is shown that our tauberian theorems become full characterizations.

Chapter 10 makes a comprehensive study of asymptotic properties of distributions. Open problems in the area are solved in Chapter 10 and new tools are developed. We obtain a complete structural description of quasiasymptotics in one variable.

We introduce the phi-transform for the local analysis of functions, measures, and distributions. In Chapter 7 the transform is used to study distributionally regulated functions (introduced here). Chapter 12 presents a characterization of measures in terms of the boundary behavior of this transform. We characterize the support of tempered distributions in Chapter 13 by various summability means of the Fourier transform.

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