My talk will follow a joint work with Maximiliano Escayola, devoted to the study of critical regularities for nilpotent group actions. The questions of critical regularities have been studied by many authors in many different contexts: starting from the classical Denjoy theorem and example, there are works by M. Herman, J.-C. Yoccoz, N. Kopell, T. Tsuboi, D. Pixton, B. Farb, J. Franks, K. Parkhe, B. Deroin, A. Navas, C. Rivas, E. Jorquera, Kim, T. Koberda, any many others. We’ll be describing the critical regularity for nilpotent group actions in algebraic terms, introducing some new technique for establishing the bounds.
By Andres Navas
By Lvzhou Chen
By Bruno Duchesne
By Hélène Eynard-Bontemps
By Emmanuel Militon
By Maxime Wolff
By Emmanuel Militon
By Juan Camilo Arosemena Serrato
By Michele Triestino
By Joaquin Brum
By Victor Kleptsyn
By Joseph Ben Geloun
By Anna Ershler
By Alexander Chervov
By Vadim Kaimanovich
