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

[Petr Somberg]

 This is a gentle remainder of our seminar!

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     Cohomology in algebra, geometry, physics and statistics




         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.

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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


Meeting ID:99598413922
Passcode:Galois


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On Wednesday  March 4 Andrey Krutov shall give  a talk  on  Non-integrable
distributions with simple infinite-dimensional Lie superalgebra of
symmetries











          For more information see the seminar web page at

          https://www.math.cas.cz/index.php/events/seminar/16




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