Foreword
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Foreword Giuseppe Gaeta1
Received: 8 April 2019 / Accepted: 10 May 2019 / Published online: 12 June 2019 © Springer Nature B.V. 2019
This special volume contains papers related to the SPT2018 (Symmetry and Perturbation Theory) conference, held in Santa Margherita di Pula near Cagliari (Sardinia, Italy) in June 2018. The conference received financial support from the Department of Mathematics of Università di Milano, the Department of Physics of Università di Cagliari, and GNFM– INdAM (Gruppo Nazionale di Fisica Matematica–Istituto Nazionale di Alta Matematica). Deep thanks are due to these Institutions, as well as to M. Cadoni and S. Walcher who helped organizing the conference, and to all the Scientific Committee. This was the ninth conference in the SPT series. While several of the previous conferences in the SPT series had their proceedings published [1–6], in this case—as in some of the previous conferences—we did not have proceedings, but rather asked to some of the participants to write “tutorial papers”, i.e. papers providing an introduction to some active research field—with the option to also include recent results. The present volume is the outcome of this project, and is also a new item in a series of SPT-related Acta Applicandae Mathematicae special volumes [7–10]. The volume contains papers devoted to rather diverse subjects, ranging from rather abstract Mathematics to applied Mathematics and Physics, as in the inter-disciplinary tradition of SPT conferences. The general focus, as the reader will see, is however—again as in the tradition of SPT conferences–on nonlinear systems and on applications (in particular, physical ones). To all the Authors, and to the anonymous Referees who helped me and who in many cases provided constructive criticism, my deepest thanks. These should also be extended to the Editors and Staff of Acta Applicandae Mathematicae. Special thanks go to Ferdinand Verhulst, who has been a participant in all of the SPT conferences—and a contributor to all of our special volumes—since the creation of the series more than twenty years ago; and to Sebastian Walcher who has not been in SPT96 but
B G. Gaeta
[email protected]
1
Dipartimento di Matematica, Università degli Studi di Milano, via Saldini 50, 20133 Milano, Italy
2
G. Gaeta
who became afterwards a pillar of the series and who also contributed to all of the special volumes, both writing papers and providing unofficial precious help. Publisher’s Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
References 1. Bambusi, D., Gaeta, G. (eds.): SPT—Symmetry and Perturbation Theory. Proceedings of a Workshop Held in Torino, December 1996. GNFM-CNR, Roma (1997) 2. Degasperis, A., Gaeta, G. (eds.): SPT98—Symmetry and Perturbation Theory. Proceedings of a Conference Held in Roma, December 1998. World Scientific, Singapore (1999) 3. Bambusi, D., Cadoni, M., Gaeta, G. (eds.): SPT2001—Symmetry and Perturbation Theory. Proceedings of a Conference Held in Cala
