Hadamard Expansions And Hyperasymptotic Evaluation

Describes a new asymptotic method of high-precision evaluation of certain integrals, related to the classical method of steepest descents.

"The author describes the recently developed theory of Hadamard expansions applied to the high-precision (hyperasymptotic) evaluation of Laplace and Laplace-type integrals. This brand new method builds on the well-known asymptotic method of steepest descents, of which the opening chapter gives a detailed account illustrated by a series of examples of increasing complexity. A discussion of uniformity problems associated with various coalescence phenomena, the Stokes phenomenon and hyperasymptotics of Laplace-type integrals follows. The remaining chapters deal with the Hadamard expansion of Laplace integrals, with and without saddle points. Problems of different types of saddle coalescence are also discussed. The text is illustrated with many numerical examples, which help the reader to understand the level of accuracy achievable. The author also considers applications to some important special functions. This book is ideal for graduate students and researchers working in asymptotics"--

Asymptotics and Mellin-Barnes Integrals, first published in 2001, provides an account of the use and properties of a type of complex integral representation that arises frequently in the study of special functions typically of interest in classical analysis and mathematical physics. After developing the properties of these integrals, their use in determining the asymptotic behaviour of special functions is detailed. Although such integrals have a long history, the book's account includes recent research results in analytic number theory and hyperasymptotics. The book also fills a gap in the literature on asymptotic analysis and special functions by providing a thorough account of the use of Mellin-Barnes integrals that is otherwise not available in other standard references on asymptotics.

Special functions arise in many problems of pure and applied mathematics, mathematical statistics, physics, and engineering. This book provides an up-to-date overview of numerical methods for computing special functions and discusses when to use these methods depending on the function and the range of parameters. Not only are standard and simple parameter domains considered, but methods valid for large and complex parameters are described as well. The first part of the book (basic methods) covers convergent and divergent series, Chebyshev expansions, numerical quadrature, and recurrence relations. Its focus is on the computation of special functions; however, it is suitable for general numerical courses. Pseudoalgorithms are given to help students write their own algorithms. In addition to these basic tools, the authors discuss other useful and efficient methods, such as methods for computing zeros of special functions, uniform asymptotic expansions, Padé approximations, and sequence transformations. The book also provides specific algorithms for computing several special functions (like Airy functions and parabolic cylinder functions, among others).

Surveys and summaries of the latest research in numerical analysis, optimization, computer algebra and scientific computing.

This collection, in three volumes, presents the scientific achievements of Roderick S C Wong, spanning 45 years of his career. It provides a comprehensive overview of the author's work which includes significant discoveries and pioneering contributions, such as his deep analysis on asymptotic approximations of integrals and uniform asymptotic expansions of orthogonal polynomials and special functions; his important contributions to perturbation methods for ordinary differential equations and difference equations; and his advocation of the Riemann–Hilbert approach for global asymptotics of orthogonal polynomials. The book is an essential source of reference for mathematicians, statisticians, engineers, and physicists. It is also a suitable reading for graduate students and interested senior year undergraduate students. Contents:Volume 1:The Asymptotic Behaviour of μ(z, β,α)A Generalization of Watson's LemmaLinear Equations in Infinite MatricesAsymptotic Solutions of Linear Volterra Integral Equations with Singular KernelsOn Infinite Systems of Linear Differential EquationsError Bounds for Asymptotic Expansions of HankelExplicit Error Terms for Asymptotic Expansions of StieltjesExplicit Error Terms for Asymptotic Expansions of MellinAsymptotic Expansion of Multiple Fourier TransformsExact Remainders for Asymptotic Expansions of FractionalAsymptotic Expansion of the Hilbert TransformError Bounds for Asymptotic Expansions of IntegralsDistributional Derivation of an Asymptotic ExpansionOn a Method of Asymptotic Evaluation of Multiple IntegralsAsymptotic Expansion of the Lebesgue Constants Associated with Polynomial InterpolationQuadrature Formulas for Oscillatory Integral TransformsGeneralized Mellin Convolutions and Their Asymptotic Expansions,A Uniform Asymptotic Expansion of the Jacobi Polynomials with Error BoundsAsymptotic Expansion of a Multiple IntegralAsymptotic Expansion of a Double Integral with a Curve of Stationary PointsSzegö's Conjecture on Lebesgue Constants for Legendre SeriesUniform Asymptotic Expansions of Laguerre PolynomialsTransformation to Canonical Form for Uniform Asymptotic ExpansionsMultidimensional Stationary Phase Approximation: Boundary Stationary PointTwo-Dimensional Stationary Phase Approximation: Stationary Point at a CornerAsymptotic Expansions for Second-Order Linear Difference EquationsAsymptotic Expansions for Second-Order Linear Difference Equations, IIAsymptotic Behaviour of the Fundamental Solution to ∂u/∂t = –(–Δ)muA Bernstein-Type Inequality for the Jacobi PolynomialError Bounds for Asymptotic Expansions of Laplace ConvolutionsVolume 2:Asymptotic Behavior of the Pollaczek Polynomials and Their ZerosJustification of the Stationary Phase Approximation in Time-Domain AsymptoticsAsymptotic Expansions of the Generalized Bessel PolynomialsUniform Asymptotic Expansions for Meixner Polynomials"Best Possible" Upper and Lower Bounds for the Zeros of the Bessel Function Jν(x)Justification of a Perturbation Approximation of the Klein–Gordon EquationSmoothing of Stokes's Discontinuity for the Generalized Bessel Function. IIUniform Asymptotic Expansions of a Double Integral: Coalescence of Two Stationary PointsUniform Asymptotic Formula for Orthogonal Polynomials with Exponential WeightOn the Asymptotics of the Meixner–Pollaczek Polynomials and Their ZerosGevrey Asymptotics and Stieltjes Transforms of Algebraically Decaying FunctionsExponential Asymptotics of the Mittag–Leffler FunctionOn the Ackerberg–O'Malley ResonanceAsymptotic Expansions for Second-Order Linear Difference Equations with a Turning PointOn a Two-Point Boundary-Value Problem with Spurious SolutionsShooting Method for Nonlinear Singularly Perturbed Boundary-Value ProblemsVolume 3:Asymptotic Expansion of the Krawtchouk Polynomials and Their ZerosOn a Uniform Treatment of Darboux's MethodLinear Difference Equations with Transition PointsUniform Asymptotics for Jacobi Polynomials with Varying Large Negative Parameters — A Riemann–Hilbert ApproachUniform Asymptotics of the Stieltjes–Wigert Polynomials via the Riemann–Hilbert ApproachA Singularly Perturbed Boundary-Value Problem Arising in Phase TransitionsOn the Number of Solutions to Carrier's ProblemAsymptotic Expansions for Riemann–Hilbert ProblemsOn the Connection Formulas of the Third Painlevé TranscendentHyperasymptotic Expansions of the Modified Bessel Function of the Third Kind of Purely Imaginary OrderGlobal Asymptotics for Polynomials Orthogonal with Exponential Quartic WeightThe Riemann–Hilbert Approach to Global Asymptotics of Discrete Orthogonal Polynomials with Infinite NodesGlobal Asymptotics of the Meixner PolynomialsAsymptotics of Orthogonal Polynomials via Recurrence RelationsUniform Asymptotic Expansions for the Discrete Chebyshev PolynomialsGlobal Asymptotics of the Hahn PolynomialsGlobal Asymptotics of Stieltjes–Wigert Polynomials Readership: Undergraduates, gradudates and researchers in the areas of asymptotic approximations of integrals, singular perturbation theory, difference equations and Riemann–Hilbert approach. Key Features:This book provides a broader viewpoint of asymptoticsIt contains about half of the papers that Roderick Wong has written on asymptoticsIt demonstrates how analysis is used to make some formal results mathematically rigorousThis collection presents the scientific achievements of the authorKeywords:Asymptotic Analysis;Perturbation Method;Special Functions;Orthogonal Polynomials;Integral Transforms;Integral Equations;Ordinary Differential Equations;Difference Equations;Riemann–Hilbert Problem

The new standard reference on mathematical functions, replacing the classic but outdated handbook from Abramowitz and Stegun. Includes PDF version.