Divergent Series, Summability and Resurgence I Monodromy and Resurge

Providing an elementary introduction to analytic continuation and monodromy, the first part of this volume applies these notions to the local and global study of complex linear differential equations, their formal solutions at singular points, their monod

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Claude Mitschi David Sauzin

Divergent Series, Summability and Resurgence I Monodromy and Resurgence

Lecture Notes in Mathematics Editors-in-Chief: J.-M. Morel, Cachan B. Teissier, Paris Advisory Board: Camillo De Lellis, Zü rich Mario di Bernardo, Bristol Alessio Figalli, Austin Davar Khoshnevisan, Salt Lake City Ioannis Kontoyiannis, Athens Gábor Lugosi, Barcelona Mark Podolskij, Aarhus Sylvia Serfaty, Paris and New York Catharina Stroppel, Bonn Anna Wienhard, Heidelberg

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Claude Mitschi • David Sauzin

Divergent Series, Summability and Resurgence I Monodromy and Resurgence

Claude Mitschi Inst. de Recherche Mathématique Avancée Université de Strasbourg et CNRS Strasbourg, France

David Sauzin CNRS UMR 8028 -- IMCCE Observatoire de Paris Paris, France

ISSN 0075-8434 ISSN 1617-9692 (electronic) Lecture Notes in Mathematics ISBN 978-3-319-28735-5 ISBN 978-3-319-28736-2 (eBook) DOI 10.1007/978-3-319-28736-2 Library of Congress Control Number: 2016940058 Mathematics Subject Classification (2010): 34M30, 30E15, 30B40, 34M03, 34M40, 37F10, 34M35

© Springer International Publishing Switzerland 2016 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, express or implied, with respect to the material contained herein or for any errors or omissions that may have been made. Printed on acid-free paper This Springer imprint is published by Springer Nature The registered company is Springer International Publishing AG Switzerland

a` la m´emoire d’Andrey Bolibrukh, C.M.

a` Lili, D.S.

Avant-Propos

Le sujet principal trait´e dans la s´erie de volumes Divergent Series, Summability and Resurgence est la th´eorie des d´eveloppements asymptotiques et des s´eries divergentes appliqu´ee aux e´ quations diff´erentielles ordinaires (EDO) et a` certaines e´ quations aux diff´erences dans le champ complexe. Les e´ quations diff´erentielles dans le champ complexe, et dans le cadre holomorphe, sont un sujet tr`es ancien. La th´eorie a e´ t´e tr`es active dans la deuxi`eme moiti´e du XIX-`eme si`ecle. En ce qui concerne les e´ quations