[Summer time:] UK, Portugal: 16:00; Spain, Italy, France, etc.: 17:00
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140. 06/10/2025 Dijana Ilišević (University of Zagreb, Croatia)
Title: Spectral properties of isometries of JB*-triples and C*-algebras
Abstract: A JB*-triple is a complex Banach space with a continuous non-associative triple product that satisfies specific axioms. Any C*-algebra can be seen as a JB*-triple with respect to the triple product defined using the algebra product and the involution. Surjective linear isometries of JB*-triples are closely related to the corresponding algebraic isomorphisms. The aim of this talk is to recall and connect some recent and not so recent results on the structure of surjective isometries of JB*-triples, specifically C*-algebras, following a long line of work starting with the celebrated Banach-Stone theorem. Attention will be focused on periodic isometries, their eigenprojections and eigenvalues. They will be studied in connection with the following inverse eigenvalue problem for isometries: when is a given finite set of modulus one complex numbers spectrum of a surjective linear isometry? The necessary conditions on such a set will be presented.
Future talks:
141. 13/10/2025 Ilja Gogić (University of Zagreb, Croatia)
142. 20/10/2025 Victor Roca i Lucio (Paris Cité University, France)
143. 27/10/2025 Michiel Smet (Ghent University, Belgium)
144. 03/11/2025 Xiaomin Tang (Heilongjiang University, China)
145. 10/11/2025 Ginevra Giordani (University of L'Aquila, Italy)
146. 17/11/2025 Yulia Zaitseva (HSE University, Russia)
147. 24/11/2025 Gerardo Martín Escolano (University of Granada, Spain)
148. 01/12/2025 Vicent Pérez Calabuig (University of Valencia, Spain)
149. 08/12/2025 Azamat Saydaliyev (Institute of Mathematics, Uzbekistan)
150. 15/12/2025 Cristina Draper (University of Málaga, Spain)
----. 22/12/2025 XX Non-Associative Day in Online´25
151. 05/01/2026 Dimas José Gonçalves (Federal University of São Carlos, Brazil)
152. 12/01/2026 Ramón González Rodríguez (University of Vigo, Spain)
153. 19/01/2026 Dimitar Grantcharov (University of Texas at Arlington, USA)
154. 26/01/2026 Bernardo Leite da Cunha (University of Santiago de Compostela, Spain)
155. 02/02/2026 Zahra Nazemian (University of Graz, Austria)
156. 09/02/2026 Hans Cuypers (Eindhoven University of Technology, Netherlands)
157. 16/02/2026 Davide Ferri (University of Torino, Italy)
158. 23/02/2026 Saikat Goswami (Institute for Advancing Intelligence, India)
159. 02/03/2026 Solomon Vishkautsan (Tel-Hai Academic College, Israel)
160. 09/03/2026 Lucia Bagnoli (National Institute for Pure and Applied Mathematics, Brazil)
161. 16/03/2026 Carsten Dietzel (University of Caen Normandy, France)
162. 23/03/2026 István Heckenberger (Philipps University Marburg, Germany)
163. 30/03/2026 Willian Franca (Federal University of Juiz de Fora, Brazil)
164. 06/04/2026 Rong Tang (Jilin University, China)
165. 13/04/2026 Maria Ferrara (University of Campania Luigi Vanvitelli, Italy)
166. 20/04/2026 Michael Lau (Laval University, Canada)
167. 27/04/2026 Abdenacer Makhlouf (University of Haute Alsace, France)
Ivan Kaygorodov • Salvatore Siciliano • Mykola Khrypсhenko • Jobir Adashev