[PHK_seminar] [Cohomology]Wednesday 26 Feb, Vsevolod Shevchishin

[Igor Khavkine]

Dear All,

The video recording of the talk by Vsevolod Shevchishin from last week 
is now available on YouTube at

   https://youtu.be/Udl1vvg83R4

This link has also been recorded at the ResearchSeminars announcement

   https://researchseminars.org/talk/PHK-cohomology-seminar/122/

Best,

Igor

On 2/24/25 1:00 PM, sender of seminar announcement via phk_seminar wrote:
> Wednesday, 26 February 2025 - 13:30 to 14:30
> Place: Institute of Mathematics of ASCR, Žitná 25, Praha 1, the blue 
> lecture room in the rear building + ZOOM meeting
> 
> Speaker: Vsevolod Shevchishin, University of Warmia and Mazury at Olsztyn
> Title: Laemotentoma: Treating of symplectic neck stretching in 
> symplectic 4-manifolds across Lagrangian surfaces
> 
> Abstract
> 
> Recently Borman-Li-Wu found an example of two Lagrangian embeddings
> 
> of the real projective plane RP^2 in a symplectic 4-manifold
> 
> which are Z_2-homologous but not isotopic, even smoothly.
> 
> 
> In my talk I make a short introduction to the technique
> 
> of the symplectic neck stretching ("Laemotentoma")
> 
> and show how it can be used to classify Lagrangian embeddings
> 
> of RP^2 in symplectic 4-manifolds. In particular, I show that
> 
> for any given number N there exist a rational symplectic 4-manifold
> 
> X and Lagrangian embeddings P_1, ..., P_N of RP^2 in X
> 
> in the same Z_2-homology class which are pairwisely not isotopic, even 
> smoothly.
> 
> --------------------------------------------------------------------------------------------------------------------------
> 
> 
> We shall open the seminar room at 13.15 for coffee and close the room at 
> 15:00
> 
> 
> Join Zoom Meeting
> 
> 
> https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9 
> <https://cesnet.zoom.us/j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRU9>
> 
> 
> MeetingID:99598413922
> 
> 
> Passcode:Galois
> 
> 
> For more information see the seminar web page at
> https://www.math.cas.cz/index.php/events/seminar/16
> 
> Cohomology in algebra, geometry, physics and statistics mailing list
> phk_seminar at math.cas.cz
> https://list.math.cas.cz/listinfo/phk_seminar@math.cas.cz
> 
> 
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