An introduction to partial differential equations
4 snadné kroky k získání vaší e-knihy
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O knize
Popis
Most descriptions of physical systems, as used in physics, engineering and, above all, in applied mathematics, are in terms of partial differential equations. This text, presented in three parts, introduces all the main mathematical ideas that are needed for the construction of solutions. The material covers all the elements that are encountered in any standard university study: first-order equations, including those that take very general forms, as well as the classification of second-order equations and the development of special solutions e.g. travelling-wave and similarity solutions.
Obsah
- Types of equation
- Exercises 1
- Of surfaces and tangents
- The Cauchy (or initial value) problem
- The semi-linear and linear equations
- The quasi-linear equation in n independent variables
- Exercises 2
- Geometry again
- The method of solution
- The general PDE with Cauchy data
- The complete integral and the singular solution
- Exercises 3
- Answers
- Types of equation
- The linear equation
- The Cauchy problem
- The quasi-linear equation
- Exercises 2
- Connection with first-order equations
- Initial data
- Exercises 3
- Transformation of variables
- Characteristic lines and the classification
- Canonical form
- Initial and boundary conditions
- Exercises 4
- The Tricomi equation 84
- General compressible flow
- The shallow-water equations
- Appendix: The hodograph transformation
- Exercise 5
- Shallow-water equations: Riemann invariants
- Shallow-water equations: simple waves
- Answers
- The Laplacian and coordinate systems
- Overview of the methods
- Introducing the method
- Two independent variables: other coordinate systems
- Linear equations in more than two independent variables
- Nonlinear equations
- Exercises 2
- The classical, elementary partial differential equations
- Equations in higher dimensions
- Nonlinear equations
- Exercises 3
- Introducing the method
- Continuous (Lie) groups
- Similarity solutions of other equations
- More general solutions from similarity solutions
- Exercises 4
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