Germs of Diffeomorphisms in the Plane

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902 Freddy Dumortier Paulo R. Rodrigues Robert Roussarie

Germs of Diffeomorphisms in the Plane

Springer-Verlag Berlin Heidelberg New York 1981

Authors

Freddy Oumortier Limburgs Universitair Centrum, Universitaire Campus B-361O Oiepenbeek, Belgium Paulo R. Rodrigues Oepartemento de Geometria, Instituto de Matematica Universidade Federal Fluminense 24000 Niteroi, Brazil Robert Roussarie Departement de Mathematique, Universite de Oijon - UER MIPC Laboratoire de Topologie ERA No.945 du CNRS, 21000 Oijon, France

AMS Subject Classifications (1980): 34C25, 34010, 34030, 58F10, 58F14, 58F22, 58F30

ISBN 3-540-11177-8 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-11177-8 Springer-Verlag New York Heidelberg Berlin

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to "Verwertungsgesellschaft Wort", Munich.

© by Springer-Verlag Berlin Heidelberg 1981 Printed in Germany

Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210

TABLE OF CONTENTS - Summary, some motivation and acknowledgments • • • • • • . . • • - Chapter I

Introduction, definitions, formal study and statement of the results

8

Introduction • • • • • • • 2

The blowing-up method

14

3

Statement of the fundamental theorem

20

4

Decomposition in sectors for singularities of vector fields in IR

§

7

5

2

and characteristic lines

22

Statement of the results concerning characteristic lines and decomposition in sectors for certain germs of planar diffeomorphisms; reduction to the fundamental theorem • • • • • • • 00

26

6

Statement of the principal C results

34

7

Statement of the topological results

39

8

Some applications and examples • • •

43

- Chapter II : Stability of type 1- and type 11- singularities.

48

Singularities of the "hyperbolic contraction"-type • • ••

48

2

Singularities of the "quasi-hyperbolic contraction"-type.

51

3

Singularities which are quasi-hyperbolic contractions with respect to a degenerate Finsler-metric

64

4

The "attracting corner"-singularities ••

74

5

Attracting arcs. • • • •

79

6

"Saddle-type"-corners.

80

IV

- Chapter III : Stability of type III-singularities •• Simplified form of the "type III-singularities" • • • • • 2 -Existence of a COO center manifold • • • 00

3

Reduction of the C problem to a formal problem

4

Reduction of the formal problem (30) to a difference equation • •

§

5

86 105

Resolution of the difference equations (39)

113

- Chapter IV : Proof of the COO results • • • • • • • • • • 1

84

108

and (40) • • •

§

83

126

00

On the unicity of germs of flat C diffeomorphisms commuting with attracting diffeomorphisms of type

127

I and II §

2

00

Characterization of germs of flat C diffeomorphisms commut