[PHK_seminar] [Cohomology]Wednesday 25 Feb, Ida Zadeh

[Igor Khavkine]

Dear All,

Unfortunately, due to a technical mixup, there is no video recording of 
the talk by Ida Zadeh from last week. However, the slides from the 
presentation are available from

   https://users.math.cas.cz/~hvle/PHK/FioresiGeometricDeepLearning2026.pdf

This link has also been recorded at the ResearchSeminars announcement

   https://researchseminars.org/talk/PHK-cohomology-seminar/148/

Best,

Igor

On 2/23/26 12:00 PM, sender of seminar announcement via phk_seminar wrote:
> Wednesday, 25 February 2026 - 12:15 to 13:15
> Place: Institute of Mathematics of ASCR, Žitná 25, Praha 1, ZOOM meeting
> 
> Speaker: Ida Zadeh, University of Southampton, UK
> Title: Tracking the symmetries of Z3-orbifold K3s within the Mathieu groups
> 
> Abstract
> 
> he goal of this talk is to determine the group of holomorphic symplectic 
> automorphisms of Z3-orbifold limits of K3 surfaces, and to track this 
> group within two of the sporadic groups Mathieu 12 and Mathieu 24. To do 
> so, I will provide a counterpart to the extensive studies by Nikulin and 
> others of the geometry and symmetries of classical Kummer surfaces, 
> which involves a variation of Kondo's lattice techniques that Taormina 
> and Wendland introduced earlier in the genesis of their symmetry surfing 
> programme. I will realise the finite group of symplectic automorphisms 
> of this class of K3 surfaces as a subgroup of Mathieu 12 and Mathieu 24 
> in terms of permutations of respectively 12 and 24 elements. The talk is 
> based on a joint work with Kasia Budzik, Anne Taormina, Mara Ungureanu 
> and Katrin Wendland.
> 
> +++++
> 
> ------------------------------------------------------
> 
> This seminar starts *EARLIER * than the usual schedule.
> 
> *We shall open the seminar room + ZOOM meeting at 12.00*for (virtual) 
> coffee and close ZOOM at 13.30
> 
> 
> Join Zoom Meeting
> 
> 
> https://cesnet.zoom.us/j/99598413922? 
> pwd=YXNFbk50aVhleXhWSGtISFViLytRUT09 <https://cesnet.zoom.us/ 
> j/99598413922?pwd=YXNFbk50aVhleXhWSGtISFViLytRUT09>
> 
> 
> Meeting ID:99598413922
> 
> Passcode:Galois
> 
> 
> -------------------------------------------------------------------------------------
> 
> On Wednesday March 4 Andrey Krutov shall give a talk on Non-integrable 
> distributions with simple infinite-dimensional Lie superalgebra of 
> symmetries <https://www.math.cas.cz/index.php/events/event/4114>
> 
> 
> 
> 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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