BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Frol Zapolsky (University of Haifa & MISANU) DTSTART:20240227T143000Z DTEND:20240227T153000Z DTSTAMP:20260423T022716Z UID:Geolis/144 DESCRIPTION:Title: Big fiber theorems and symplectic rigidity\nby Frol Zapolsky (Univers ity of Haifa & MISANU) as part of Geometria em Lisboa (IST)\n\n\nAbstract\ nIn many areas of mathematics there are theorems of the following kind: An y map in a suitable class has a big fiber. The classes of maps and the not ions of size vary from field to field. In my talk I'll present several exa mples of this phenomenon. I'll show how Gromov's notion of ideal valued-me asures derived from cohomology can be used to prove some of them. I'll als o introduce objects which are a suitable generalization of ideal-valued me asures in the context of symplectic geometry\, called ideal-valued quasi-m easures\, indicate how they can be constructed using relative symplectic c ohomology\, a tool recently introduced by U. Varolgunes\, and demonstrate how they can be used to obtain new symplectic rigidity results. Based on j oint work with A. Dickstein\, Y. Ganor\, and L. Polterovich.\n LOCATION:https://researchseminars.org/talk/Geolis/144/ END:VEVENT END:VCALENDAR