**Author**: Victor I. Burenkov

**Publisher:** B. G. Teubner Gmbh

**ISBN:**

**Category:** Sobolev spaces

**Page:** 312

**View:** 994

Classical Sobolev spaces, based on Lebesgue spaces on an underlying domain with smooth boundary, are not only of considerable intrinsic interest but have for many years proved to be indispensible in the study of partial differential equations and variational problems. Many developments of the basic theory since its inception arise in response to concrete problems, for example, with the (ubiquitous) sets with fractal boundaries. The theory will probably enjoy substantial further growth, but even now a connected account of the mature parts of it makes a useful addition to the literature. Accordingly, the main themes of this book are Banach spaces and spaces of Sobolev type based on them; integral operators of Hardy type on intervals and on trees; and the distribution of the approximation numbers (singular numbers in the Hilbert space case) of embeddings of Sobolev spaces based on generalised ridged domains. This timely book will be of interest to all those concerned with the partial differential equations and their ramifications. A prerequisite for reading it is a good graduate course in real analysis.

The book deals with the two scales Bsp,q and Fsp,q of spaces of distributions, where ‐∞s∞ and 0p,q≤∞, which include many classical and modern spaces, such as Hölder spaces, Zygmund classes, Sobolev spaces, Besov spaces, Bessel-potential spaces, Hardy spaces and spaces of BMO-type. It is the main aim of this book to give a unified treatment of the corresponding spaces on the Euclidean n-space Rsubn

The spaces of functions with derivatives in p, called the Sobolev spaces, play an important role in modern analysis. During the last decades, these spaces have been intensively studied and by now many problems associated with them have been solved. However, the theory of these function classes for domains with nonsmooth boundaries is still in an unsatisfactory state.In this book, which partially fills this gap, certain aspects of the theory of Sobolev spaces for domains with singularities are studied. We mainly focus on the so-called imbedding theorems, extension theorems and trace theorems that have numerous applications to partial differential equations. Some of such applications are given.Much attention is also paid to counter examples showing, in particular, the difference between Sobolev spaces of the first and higher orders. A considerable part of the monograph is devoted to Sobolev classes for parameter dependent domains and domains with cusps, which are the simplest non-Lipschitz domains frequently used in applications.This book will be interesting not only to specialists in analysis but also to postgraduate students.

The spaces of functions with derivatives in Lp, called the Sobolev spaces, play an important role in modern analysis. During the last decades, these spaces have been intensively studied and by now many problems associated with them have been solved. However, the theory of these function classes for domains with nonsmooth boundaries is still in an unsatisfactory state. In this book, which partially fills this gap, certain aspects of the theory of Sobolev spaces for domains with singularities are studied. We mainly focus on the so-called imbedding theorems, extension theorems and trace theorems that have numerous applications to partial differential equations. Some of such applications are given. Much attention is also paid to counter examples showing, in particular, the difference between Sobolev spaces of the first and higher orders. A considerable part of the monograph is devoted to Sobolev classes for parameter dependent domains and domains with cusps, which are the simplest non-Lipschitz domains frequently used in applications. This book will be interesting not only to specialists in analysis but also to postgraduate students. Contents:Introduction to Sobolev Spaces for Domains:Basic Properties of Sobolev SpacesExamples of “Bad” Domains in the Theory of Sobolev SpaceSobolev Spaces for Domains Depending on Parameters:Extension of Functions Defined on Parameter Dependent DomainsBoundary Values of Functions with First Derivatives Lp on Parameter Dependent DomainsSobolev Spaces for Domains with Cusps:Extension of Functions to the Exterior of a Domain with the Vertex of a Peak on the BoundaryBoundary Values of Sobolev Functions on Non-Lipschitz Domains Bounded by Lipschitz SurfacesBoundary Values of Functions in Sobolev Spaces for Domains with PeaksImbedding and Trace Theorems for Domains with Outer Peaks and for General Domains Readership: Mathematicians. keywords:Sobolev Spaces;Domains with Cusps;Imbedding and Extension Theorems;Boundary Values of Functions “… the book may be useful and interesting for mathematicians working in other related areas, such as the rest of PDE theory, the calculus of variations, numerical analysis and the theory of functions of several real variables … The book is strongly recommended to researchers and advanced students.” European Mathematical Society Newsletter

From the Preface: The finite element method is now widely used in many areas of applied mathematics, physics and engineering....The object of this book is to give a thorough introduction to a number of theoretical fields connected with the finite element method....It has developed as a result of various lectures on the analysis of the finite element method taught by the author at the ETH in Zurich. Encouraged by the response to these lectures, the author feels that the book has become a readable text which can help ordinary mortals to start to understand the theory of finite element methods. The reader is assumed to have only an undergraduate background in mathematical analysis.

Sobolev spaces play an outstanding role in modern analysis, in particular, in the theory of partial differential equations and its applications in mathematical physics. They form an indispensable tool in approximation theory, spectral theory, differential geometry etc. The theory of these spaces is of interest in itself being a beautiful domain of mathematics. The present volume includes basics on Sobolev spaces, approximation and extension theorems, embedding and compactness theorems, their relations with isoperimetric and isocapacitary inequalities, capacities with applications to spectral theory of elliptic differential operators as well as pointwise inequalities for derivatives. The selection of topics is mainly influenced by the author’s involvement in their study, a considerable part of the text is a report on his work in the field. Part of this volume first appeared in German as three booklets of Teubner-Texte zur Mathematik (1979, 1980). In the Springer volume “Sobolev Spaces”, published in English in 1985, the material was expanded and revised. The present 2nd edition is enhanced by many recent results and it includes new applications to linear and nonlinear partial differential equations. New historical comments, five new chapters and a significantly augmented list of references aim to create a broader and modern view of the area.