Asymptotic Analysis for Integrable Connections with Irregular Singular Points

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1075

Hideyuki Majima

Asymptotic Analysis for Integrable Connections with Irregular Singular Points

Springer-Verlag Berlin Heidelberg New York Tokyo 1984

Author

Hideyuki Majima Department of Mathematics, Faculty of Science, University of Tokyo Hongo, Tokyo 113, Japan

AMS Subject Classification (1980): 58A 17, 35C20; 32L10 ISBN 3-540-13375-5 Springer-Verlag Berlin Heidelberg New York Tokyo ISBN 0-387-13375-5 Springer-Verlag New York Heidelberg Berlin Tokyo

This work is subjectto 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 1984 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach / Bergstr. 2146/3140-543210

Dedicated to the Author's Grand-Professor Masuo Hukuhara on his 77th Birthday

Abstract Using strongly asymptotic expansions of functions of several variables, we prove existence theorems of asymptotic solutions to integrable systems of partial differential equations of the first order with irregular singular points under certain general conditions.

We also prove analytic splitting lemmas for completely inte-

grable linear Pfaffian systems.

Moreover, for integrable connections with irregular

singular points, we formulate and solve the Riemann­Hilbert­Birkhoff problem, and prove analogues of Poincare's lemma and de Rham cohomology theorem under certain general conditions.

Key words and phrases.

Strongly asymptotically developable, strongly asymptotic

expansions of functions of several variables, sheaf of germs of strongly asymptotically developable functions, real blow­up of a complex manifold along a normal crossing divisor, vanishing theorem, integrable system of partial differential equations of the first order with regular and irregular singular points, existence theorems of asymptotic solutions to integrable systems with singular points, splitting lemmas for completely integrable Pfaffian systems with singular points, Stokes multipliers, Stokes phenomena, Riemann­Hilbert­Birkhoff problem, Integrable connections with regular and irregular singular points, V­de Rharn complex for inte­ grable connection V, V­Poincare

lemma, V­de Rham cohomology theorem.

Preface The purpose of this paper is tolay a foundation of studies on integrable connections, i.e., locally speaking, completely integrable Pfaffian systems or systems of partial differential equations of the first order, with irregular singular points.

Using strongly asymptotic expansions of functions of several variables,

we prove existence theorems of asymptotic solutions to integrable systems of partial differential equations under certain general conditions.

Moreover, we formu-

late and solve the Riemann­Hilbert­Birkhoff p