Inverse Problems is a monograph which contains a self-contained presentation of the theory of several major inverse problems and the closely related results from the theory of ill-posed problems. The book is aimed at a large audience which include graduate students and researchers in mathematical, physical, and engineering sciences and in the area of numerical analysis.

The dynamical systems method (DSM) for solving operator equations, especially nonlinear and ill-posed Many novel results in the presentation of the theory of one-dimensional inverse problems Many novel results in the presentation of inverse obstacle scattering, including very weak assumptions on the smoothness of the obstacle, stability estimates for the solution, and an analysis of the earlier works A mathematically justified method, developed by the author for solving multidiemsional inverse potential scattering problem with fixed-energy data; error estimates A study of a non-overdetermined inverse problem Derivation of the analytical formulas for the S-matrix for eletromagnetic and acoustic wave scattering by small bodies of arbitrary shapes Discussion of the Pompeiu problem and the Schiffer's conjecture Includes supplementary material: sn.pub/extras

Autorentext

Alexander G. Ramm, Ph.D., was born in Russia, immigrated to the U.S. in 1979, and is a U.S. citizen. He is Professor of Mathematics with broad interests in analysis, scattering theory, inverse problems, theoretical physics, engineering, signal estimation, tomography, theoretical numerical analysis, and applied mathematics. He is an author of 690 research papers, 16 monographs, and an editor of 3 books. He has lectured in many universities throughout the world, presented approximately 150 invited and plenary talks at various conferences, and has supervised 11 Ph.D. students. He was Fulbright Research Professor in Israel and in Ukraine, distinguished visiting professor in Mexico and Egypt, Mercator professor, invited plenary speaker at the 7th PACOM, won the Khwarizmi international award, and received other honors. Recently he solved inverse scattering problems with non-over-determined data and the many-body wave-scattering problem when the scatterers are small particles of an arbitraryshape; Dr. Ramm used this theory to give a recipe for creating materials with a desired refraction coefficient, gave a solution to the refined Pompeiu problem and proved the refined Schiffers conjecture.

Klappentext

Inverse problems are the problems that consist of finding an unknown property of an object or a medium from the observation or a response of this object or a medium to a probing signal. Thus the theory of inverse problems yields a theoretical basis for remote sensing and non-destructive evaluation. For example, if an acoustic plane wave is scattered by an obstacle, and one observes the scattered field from the obstacle, or in some exterior region, then the inverse problem is to find the shape and material properties of the obstacle. Such problems are important in the identification of flying objects (airplanes, missiles etc.) objects immersed in water (submarines, fish) and in many other situations.

This book presents the theory of inverse spectral and scattering problems and of many other inverse problems for differential equations in an essentially self-contained way. An outline of the theory of ill-posed problems is given, because inverse problems are often ill-posed. There are many novel features in this book. The concept of property C, introduced by the author, is developed and used as the basic tool for a study of a wide variety of one- and multi-dimensional inverse problems, making the theory easier and shorter.

New results include

recovery of a potential from I-function and applications to classical and new inverse scattering and spectral problems,

study of inverse problems with"incomplete data",

study of some new inverse problems for parabolic and hyperbolic equations,

discussion of some non-overdetermined inverse problems,

a study of inverse problems arising in the theory of ground-penetrating radars,

development of DSM (dynamical systems method) for solving ill-posed nonlinear operator equations,

comparison of the Ramm's inversion method for solving fixed-energy inverse scattering problem with the method based on the Dirichlet-to-Neumann map,

derivation of the range of applicability and error estimates for Born's inversion,

a study of some integral geometry problems, including tomography,

inversion formulas for the spherical means,

proof of the invertibility of the steps in the Gel'fand-Levitan and Marchenko inversion procedures,

derivation of the inversion formulas and stability estimates for the multidimensional inverse scattering problems with fixed-energy noisy discrete data,

new uniqueness and stability results in obstacle inverse scattering,

formulation and a solution of an inverse problem of radiomeasurements,

methods for finding small inhomogeneities from surface scattering data.

Inhalt
Methods of Solving Ill-Posed Problems.- One-Dimensional Inverse Scattering and Spectral Problems.- Inverse Obstacle Scattering.- Stability of the Solutions to 3D Inverse Scattering Problems with Fixed-Energy Data.- Non-Uniqueness and Uniqueness Results.- Inverse Problems of Potential Theory and Other Inverse Source Problems.- Non-Overdetermined Inverse Problems.- Low-Frequency Inversion.- Wave Scattering by Small Bodies of Arbitrary Shapes.- The Pompeiu Problem.