Function Spaces and Partial Differential Equations

Description

This book presents a comprehensive treatment of aspects of classical and modern analysis relating to theory of ‘partial differential equations’ and the associated ‘function spaces’. It begins with a quick review of basic properties of harmonic functions and Poisson integrals and then moves into a detailed study of Hardy spaces. The classical Dirichlet problem is considered and a variety of methods for its resolution ranging from potential theoretic (Perron’s method of sub-harmonic functions and Wiener’s criterion, Green’s functions and Poisson integrals, the method of layered potentials or integral equations) to variational (Dirichlet principle) are presented. Parallel to this is the development of the necessary function spaces: Lorentz and Marcinkiewicz spaces, Sobolev spaces (integer as well as fractional order), Hardy spaces, the John-Nirenberg space BMO, Morrey and Campanato spaces, Besov spaces and Triebel-Lizorkin spaces. Harmonic analysis is deeply intertwined with the topics covered and the subjects of summability methods, Tauberian theorems, convolution algebras, Calderon-Zygmund theory of singular integrals and Littlewood-Paley theory that on the one hand connect to various PDE estimates (Calderon-Zygmund inequality, Strichartz estimates, Mihlin-Hormander multipliers, etc.) and on the other lead to a unified characterisation of various function spaces are discussed in great depth. The book ends by a discussion of regularity theory for second order elliptic equations in divergence form— first with continuous and next with measurable coefficients—and covers, in particular, De Giorgi’s theorem, Moser iteration, Harnack inequality and local boundedness of solutions. (The case of elliptic systems and related topics is discussed in the exercises.) 13 Maximal Function; Bounding Averages and Pointwise Convergence 14 Harmonic-Hardy Spaces hp(ℍ) 15 Sobolev Spaces Wk,p(Ω); A Resolution of the Dirichlet Principle 16 Singular Integral Operators and Vector-Valued Inequalities 17 Littlewood-Paley Theory, Lp-Multipliers and Function Spaces 18 Morrey and Campanato vs. Hardy and John-Nirenberg Spaces 19 Layered Potentials, Jump Relations and Existence Theorems 20 Second Order Equations in Divergence Form: Continuous Coefficients 21 Second Order Equations in Divergence Form: Measurable Coefficients