Fractional Sobolev Spaces and Inequalities Cambridge Tracts in Mathematics Series

The fractional Sobolev spaces studied in the book were introduced in the 1950s by Aronszajn, Gagliardo and Slobodeckij in an attempt to fill the gaps between the classical Sobolev spaces. They provide a natural home for solutions of a vast, and rapidly growing, number of questions involving differential equations and non-local effects, ranging from financial modelling to ultra-relativistic quantum mechanics, emphasising the need to be familiar with their fundamental properties and associated techniques. Following an account of the most basic properties of the fractional spaces, two celebrated inequalities, those of Hardy and Rellich, are discussed, first in classical format (for which a survey of the very extensive known results is given), and then in fractional versions. This book will be an Ideal resource for researchers and graduate students working on differential operators and boundary value problems.

1. Preliminaries; 2. Classical Sobolev spaces; 3. Fractional Sobolev spaces; 4. Eigenvalues of the fractional p-Laplacian; 5. Classical (local) Hardy inequalities; 6. Fractional analogues; 7. Classical and fractional inequalities of Rellich type; References; Symbol index; Author index; Index of terms.

D. E. Edmunds was Professor of Mathematics at Sussex University for twenty-six years; now Emeritus. He has co-authored nine books and written more than 230 papers. Honours include the LMS Pólya Prize, the Czech Academy of Sciences Bolzano Medal and the Medal for Mathematics of the Czech Mathematical Society.
W. D. Evans was a Professor in the School of Mathematics, Cardiff University for more than 30 years and is now Emeritus there. In 2011 he was elected Fellow of the Learned Society of Wales. His publications include eight co-authored books and about 200 research papers.