Preface

1. Introduction

Part I. Ordinary Differential Equations: 2. Point transformations and their generators

3. Lie point symmetries of ordinary differential equations: the basic definitions and properties

4. How to find the Lie point symmetries of an ordinary differential equation

5. How to use Lie point symmetries: differential equations with one symmetry

6. Some basic properties of Lie algebras

7. How to use Lie point symmetries: second order differential equations admitting a G2

8. Second order differential equations admitting a G3IX

9. Higher order differential equations admitting more than one Lie point symmetry

10 Systems of second order differential equations

11. Symmetries more general than Lie point symmetries

12. Dynamical symmetries: the basic definitions and properties

13. How to find and use dynamical symmetries for systems possessing a Lagrangian

14. Systems of first order differential equations with a fundamental system of solutions

Part II. Partial Differential Equations: 15. Lie point transformations and symmetries

16. How to determine the point symmetries of partial differential equations

17. How to use Lie point symmetries of partial differential equations I: generating solutions by symmetry

18. How to use Lie point symmetries of partial differential equations II: similarity variables and reduction of the number of variables

19. How to use Lie point symmetries of partial differential equations III: multiple reduction of variables and differential invariants

20. Symmetries and the separability of partial differential classification

21. Contact transformations and contact symmetries of partial differential equations, and how to use them

22. Differential equations and symmetries in the language of forms

23. Lie-Backlund transformations

24. Lie-Backlund symmetries and how to find them

25. How to use Lie-Backlund symmetries

Appendices

Index.