目录 1 Introduction and Overview 1.1 Objectives 1.2 Past and Present 1.3 Methods 1.4 Supplements 1.5 Arrangement of Contents 2 Linear Wave Equations 2.1 Expression of Solutions 2.1.1 Expression of Solutions When n < 3 2.1.2 Method of Spherical Means 2.1.3 Expression of Solutions When n( > 1) Is Odd 2.1.4 Expression of Solutions When n( > 2) Is Even 2.2 Expression of Fundamental Solutions 2.3 Fourier Transform 2.4 Appendix--The Area of Unit Sphere 3 Sobolev Type Inequalities with Decay Factor 3.1 Preliminaries 3.1.1 Commutant Relations 3.1.2 LP,q(IRn) space 3.1.3 Generalized Sobolev Norms 3.1.4 Commutativity with the Wave Operator 3.1.5 Representing Derivatives Under Ordinary Coordinates by Derivatives Under Polar Coordinates 3.2 Some Variations of Classical Sobolev Embedding Theorems 3.2.1 Sobolev Embedding Theorems on a Unit Sphere 3.2.2 Sobolev Embedding Theorems on a Ball …… 4 Estimates on Solutions to the Linear Wave Equations 5 Some Estimates on Product Functions and Composite Functions 6 Cauchy Problem of the Second-Order Linear Hyperbolic Equations 7 Reduction of Nonlinear Wave Equations to a Second-Order Quasi-linear Hyperbolic System 8 Cauchy Problem of One-Dimensional Nonlinear Wave Equations 9 Cauchy Problem of n( > 3)-Dimensional Nonlinear Wave Equations 10 Cauchy Problem of Two-Dimensional Nonlinear Wave Equations 11 Cauchy Problem of Four-Dimensional Nonlinear Wave Equations 12 Null Condition and Global Classical Solutions to the Cauchy Problem of Nonlinear Wave Equations 13 Sharpness of Lower Bound Estimates on the Life-Span of Classical Solutions to the Cauchy Problem--The Case that the Nonlinear Term F = F(Du, DxDU) on the Right-Hand Side Does not Depend on u Explicitly 14 Sharpness of Lower Bound Estimates on the Life-Span of Classical Solutions to the Cauchy Problem--The Case that the Nonlinear Term F -- F(u, DuxDxDu) on the Right-Hand Side Depends on u Explicitly 15 Applications and Developments References Index
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