On Global Univalence Theorems

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977

T Parthasarathy

On

Global Univalence Theorems

Springer-Verlag Berlin Heidelberg New York 1983

Author

1. Parthasarathy Indian Statistical Institute, Delhi Centre 7, S.J.S. Sansanwal Marg., New Delhi 110016, India

AMS Subject Classifications (1980): 26-02,26810,90-02, 90A 14, 90C30 ISBN 3-540-11988-4 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-11988-4 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 1983 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2146/3140-543210

PREFACE This volume of lecture notes contains results on global univalent mappings. Some of the material of this volume had been given as seminar talks at the Department of Mathematics, university of Kansas, Lawrence during 1978-79 and at the Indian Statistical Institute, Delhi Centre during 1979-80. Even though the classical local inverse function theorem is well-known, Gale-Nikaido's global univalent results obtained in (1965) are not known to many mathematicians that I have sampled.

Recently some significant contributions have

been made in this area notably by Garcia-Zangwill (1979), Mas-Colell (1979) and Scarf-Hirsch-ChilniskY (1980).

Global univalent results are as important as local

univalent results and as such I thought it is worthwhile to make these results well-known to the mathematical

at large.

Also I believe that there are

very many interesting open problems which are worth solving in this branch of Mathematics.

I have also included a number of applications from different

disciplines like Differential Equations, Mathematical Programming, Statistics etc.

Mathematical

Some of the results have appeared onlY in Journals

and we are bringing them to-gether in one nlace. These notes contain some new results.

For example Proposition 2, Theorem 4

in Chapter II, Theorem 4, Theorem 5 in Chapter III, Theorem 2" in Chapter V, Theorem 8 in Chapter VI, Theorem 2 in Chapter VII, Theorem 9 in Chapter VIII are new results. It is next to impossible to cover all the known results on global univalent mappings for lack of space and time.

For example a notable omission could be the

role played by univalent mappings whose domain is comnlex numbers.

We have also

not done enough justice to the nroblem when a PL-function will be a homeomorphism in view of the growLng importance of such functions.

We have certainly given

references where an interested reader can get more information. I am grateful to Professors : Andreu Mas-Colell, Ruben

Albrecht Dold

and an anonymous referee for their several constructive suggestions on various parts