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Ebert M.R., Reissig M. Methods for Partial Differential Equations: Qualitative Properties of Solutions, Phase Space Analysis, Semilinear Models

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• Отредактирован Springer International Publishing AG, 2018. — 473 p. — ISBN 3319664557.
This book provides an overview of different topics related to the theory of partial differential equations. Selected exercises are included at the end of each chapter to prepare readers for the "research project for beginners" proposed at the end of the book. It is a valuable resource for advanced graduates and undergraduate students who are interested in specializing in this area.
The book is organized in five parts:
In Part 1 the authors review the basics and the mathematical prerequisites, presenting two of the most fundamental results in the theory of partial differential equations: the Cauchy-Kovalevskaja theorem and Holmgren's uniqueness theorem in its classical and abstract form. It also introduces the method of characteristics in detail and applies this method to the study of Burger's equation.
Part 2 focuses on qualitative properties of solutions to basic partial differential equations, explaining the usual properties of solutions to elliptic, parabolic and hyperbolic equations for the archetypes Laplace equation, heat equation and wave equation as well as the different features of each theory. It also discusses the notion of energy of solutions, a highly effective tool for the treatment of non-stationary or evolution models and shows how to define energies for different models.
Part 3 demonstrates how phase space analysis and interpolation techniques are used to prove decay estimates for solutions on and away from the conjugate line. It also examines how terms of lower order (mass or dissipation) or additional regularity of the data may influence expected results.
Part 4 addresses semilinear models with power type non-linearity of source and absorbing type in order to determine critical exponents: two well-known critical exponents, the Fujita exponent and the Strauss exponent come into play. Depending on concrete models these critical exponents divide the range of admissible powers in classes which make it possible to prove quite different qualitative properties of solutions, for example, the stability of the zero solution or blow-up behavior of local (in time) solutions.
The last part features selected research projects and general background material.
Contents
Part I
Introduction
Partial Differential Equations in Models
Basics for Partial Differential Equations
The Cauchy-Kovalevskaja Theorem
Holmgren’s Uniqueness Theorem
Method of Characteristics
Burgers’ Equation
Part II
Laplace Equation—Properties of Solutions—Starting Point of Elliptic Theory
Heat Equation—Properties of Solutions—Starting Point of Parabolic Theory
Wave Equation—Properties of Solutions—Starting Point of Hyperbolic Theory
The Notion of Energy of Solutions: One of the Most Important Quantities
Part III
Phase Space Analysis for the Heat Equation
Phase Space Analysis and Smoothing for Schrödinger Equations
Phase Space Analysis for Wave Models
Phase Space Analysis for Plate Models
The Method of Stationary Phase and Applications
Part IV
Semilinear Heat Models
Semilinear Classical Damped Wave Models
SemilinearWave Models with a Special Structural Dissipation
Semilinear Classical Wave Models
Semilinear Schrödinger Models
Linear Hyperbolic Systems
Part V
Research Projects for Beginners
Background Material
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