Chapter 1. Introduction ......................................... 1
Chapter 2. Invariant valuations and solutions of l.d.e. ......... 7
Chapter 3. Examples and use of invariant valuations ............ 17
Chapter 4. Continuity of derivations, geometry and examples .... 23
Chapter 5. Continuity and field extensions ..................... 37
Chapter 6. Invariant valuations and singularities of l.d.e. .... 49
Chapter 7. Existence and geometry of invariant valuations ...... 55
Bibliography ................................................... 67
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