BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Vsevolod Shevchishin (University of Warmia and Mazury at Olsztyn) DTSTART:20250226T123000Z DTEND:20250226T133000Z DTSTAMP:20260502T043435Z UID:PHK-cohomology-seminar/122 DESCRIPTION:Title: Laemotentoma: Treating of symplectic neck stretching in s ymplectic 4-manifolds across Lagrangian surfaces\nby Vsevolod Shevchis hin (University of Warmia and Mazury at Olsztyn) as part of Prague-Hradec Kralove seminar Cohomology in algebra\, geometry\, physics and statistics\ n\nLecture held in blue lecture room\, rear building\, ground floor.\n\nAb stract\nRecently Borman-Li-Wu found an example of two Lagrangian embedding s\nof the real projective plane RP^2 in a symplectic 4-manifold\nwhich are Z_2-homologous but not isotopic\, even smoothly.\n\nIn my talk I make a s hort introduction to the technique\nof the symplectic neck stretching ("La emotentoma")\nand show how it can be used to classify Lagrangian embedding s\nof RP^2 in symplectic 4-manifolds. In particular\, I show that\nfor any given number N there exist a rational symplectic 4-manifold\nX and Lagran gian embeddings P_1\, ...\, P_N of RP^2 in X\nin the same Z_2-homology cla ss which are pairwisely not isotopic\, even smoothly.\n LOCATION:https://researchseminars.org/talk/PHK-cohomology-seminar/122/ END:VEVENT END:VCALENDAR