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Series on Analysis, Applications and Computation – Vol. 3 I S A A C

Topics in

Mathematical Analysis

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Series on Analysis, Applications and Computation

Series Editors: Heinrich G W Begehr (Freie Univ. Berlin, Germany)

Robert Pertsch Gilbert (Univ. Delaware, USA) M. W. Wong (York Univ., Canada)

Advisory Board Members:

Mikhail S Agranovich (Moscow Inst. of Elec. & Math., Russia), Ryuichi Ashino (Osaka Kyoiku Univ., Japan),

Alain Bourgeat (Univ. de Lyon, France), Victor Burenkov (Cardiff Univ., UK), Jinyuan Du (Wuhan Univ., China), Antonio Fasano (Univ. di Firenez, Italy),

Massimo Lanza de Cristoforis (Univ. di Padova, Italy), Bert-Wolfgang Schulze (Univ. Potsdam, Germany), Masahiro Yamamoto (Univ. of Tokyo, Japan) & Armand Wirgin (CNRS-Marseille, France)

Published

Vol. 1: Boundary Values and Convolution in Ultradistribution Spaces by R D Carmichael, A Kami½ski & S Pilipoviƒ

Vol. 2: Complex Analysis by M W Wong

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N E W J E R S E Y • L O N D O N • S I N G A P O R E • BEIJING • S H A N G H A I • H O N G K O N G • TA I P E I • C H E N N A I

World Scientific

Series on Analysis, Applications and Computation – Vol. 3 I S A A C

Topics in

Mathematical Analysis

edited by

º Paolo Ciatti

º Eduardo Gonzalez

º Massimo Lanza de Cristoforis

Università di Padova, Italy

º Gian Paolo Leonardi

Università di Modena e Reggio Emilia, Italy

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British Library Cataloguing-in-Publication Data

A catalogue record for this book is available from the British Library.

For photocopying of material in this volume, please pay a copying fee through the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923, USA. In this case permission to photocopy is not required from the publisher.

ISBN-13 978-981-281-105-9 ISBN-10 981-281-105-2

All rights reserved. This book, or parts thereof, may not be reproduced in any form or by any means, electronic or mechanical, including photocopying, recording or any information storage and retrieval system now known or to be invented, without written permission from the Publisher.

Copyright © 2008 by World Scientific Publishing Co. Pte. Ltd. Published by

World Scientific Publishing Co. Pte. Ltd. 5 Toh Tuck Link, Singapore 596224

USA office: 27 Warren Street, Suite 401-402, Hackensack, NJ 07601 UK office: 57 Shelton Street, Covent Garden, London WC2H 9HE

Printed in Singapore.

TOPICS IN MATHEMATICAL ANALYSIS

Series on Analysis, Applications and Computation — Vol. 3

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April 7, 2008 17:13 World Scientific Review Volume - 9in x 6in topics

v

published with the contribution of

Universit`a di Padova

Dipartimento di Metodi e Modelli Matematici per le Scienze Applicate

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Preface

The Minicorsi of Mathematical Analysis have been held at the University of Padova since 1998, and the subject of the Lectures ranges in various areas of Mathematical Analysis including Complex Variable, Differential Equations, Geometric Measure Theory, Harmonic Analysis, Potential Theory, Spectral Theory.

The purposes of the Minicorsi are:

• to provide an update on the most recent research themes in the field,

• to provide a presentation accessible also to beginners.

The Lecturers have been selected both on the basis of their outstand-ing scientific level, and on their clarity of exposition. Thus the Minicorsi and the present collection of Lectures are particularly indicated to young Researchers and to Graduate Students.

In this volume, the organizers have collected most of the lectures held in the years 2000–2003, and intend to provide the reader with material oth-erwise difficult to find and written in a way also accessible to nonexperts.

The organizers wish to express their sincere gratitude to the several participants who have contributed to the success of the Minicorsi.

The organizers are also indebted to the University of Padova, and in par-ticular to the ‘Dipartimento di Metodi e Modelli Matematici per le Scienze Applicate’, and to the ‘Dipartimento di Matematica Pura ed Applicata’ of the University of Padova, both for the hospitality, and for the financial sup-port. The organizers also acknowledge the financial support offered by the ‘Gruppo Nazionale per l’Analisi Matematica, la Probabilit`a e le loro Appli-cazioni’, and the European Commission IHP Network “Harmonic Analysis and Related Problems”.

P. Ciatti, E. Gonzalez, M. Lanza de Cristoforis, G.P. Leonardi

vii

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Contents

Preface vii

Complex variables and potential theory 1

1. Integral representations in complex, hypercomplex and

Clifford analysis 3

H. Begehr

2. Nonlinear potential theory in metric spaces 29

O. Martio

Differential equations and nonlinear analysis 61

3. An introduction to mean curvature flow 63

G. Bellettini

4. Introduction to bifurcation theory 103

P. Dr´abek

5. A nonlinear eigenvalue problem 175

P. Lindqvist

ix

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x Contents

6. Nonlinear elliptic equations with critical

and supercritical Sobolev exponents 205

D. Passaseo

7. Eigenvalue analysis of elliptic operators 227

G. Rozenblum

8. A glimpse of the theory of nonlinear semigroups 257

E. Vesentini

Harmonic analysis 279

9. Integral geometry and spectral analysis 281

M. Agranovsky

10. Fourier analysis and geometric combinatorics 321

A. Iosevich

11. Lectures on eigenfunctions of the Laplacian 337

C. D. Sogge

12. Five lectures on harmonic analysis 361

F. Soria

13. Fractal analysis, an approach via function spaces 413

H. Triebel

Author Index 449

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