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Cotygodniowe seminarium badawcze
2021-10-26, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Magdalena Zielenkiewicz (MIMUW)
Rozkłady komórkowe dla Grassmannianów kołczanowych
Mając dany kołczan i jego reprezentację, grassmannian kołczanowy parametryzuje jej podreprezentacje ustalonego (wektora) wymiaru. Niektóre grassmanniany kołczanowe posiadają rozkład na komórki afiniczne. Opowiem o tym, co wiadomo - które grassmanniany kołczanowe dopuszcz...
2021-10-19, godz. 16:30, sala 4070 + Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Bob Oliver (LAGA, Paris)
A Krull-Remak-Schmidt theorem for fusion systems
The Krull-Remak-Schmidt theorem, when restricted to finite groups, implies that every finite group factorizes as a product of indecomposable subgroups which areunique up to isomorphism. But the theorem actually says much more. For example, as a special case, it implies that this factorization is uni...
2021-10-12, godz. 16:30, 4070 oraz zoom : 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Jakub Koncki (MIMUW)
Boundness of motivic Chern class
I will define the equivariant motic Chern class. I will show that it satisfies certain smallness condition. This condition allows to compare the motivic Chern class with the stable envelopes. ...
2021-06-08, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Jarek Kędra (University of Aberdeen)
On quasimorphisms invariant under automorphisms
Quasimorphisms comprise a good function theory on groups and many groups admits an abundance of them. It was recently discovered by Brandenbursky and Marcinkowski that the free group on two generators admits a quasimorphism that is invariant under all automorphisms of F_2. I will present a more...
2021-05-25, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Agnieszka Bodzenta (MIMUW)
Quasi-hereditary algebras and, more generally, highest weight categories first appeared as categories of perverse sheaves on a stratified topological space. Another example is the category O of Bernstein-Bernstein-Gelfand. In the talk I will recall the classical Ringel duality for highest weig...
2021-05-18, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Adam Przeździecki (SGGW)
Set-theoretic problems in constructing localizations
https://www.mimuw.edu.pl/~aweber/STA/AP-lokalizacja.pdf ...
2021-05-11, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Maria Yakerson (ETH Zürich)
Algebraic and hermitian K-theory in motivic homotopy theory
Algebraic K-theory space, as a motivic space, has a known geometric model given by (Z copies of) the infinite Grassmannian. In the new geometric model that we offer, the infinite Grassmannian is replaced by the Hilbert scheme of the infinite affine space, stabilized with respect to degree. A...
2021-04-27, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
László Fehér (Eötvös Loránd University, Budapest)
Plücker formulas and motivic classes of coincident root loci
https://www.mimuw.edu.pl/~aweber/STA/plucker-abstract.pdf ...
2021-04-20, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Akos Matszangosz (Renyi Institute (Budapeszt))
Cohomology rings of real flag manifolds
The cohomology ring of a complex (partial) flag manifold has two classical descriptions; a topological one (via characteristic classes) and a geometric one (via Schubert classes). Similar descriptions are well-known for real flag manifolds X with mod 2 coefficients. In this talk I will discuss some ...
2021-04-13, godz. 16:30, Zoom: 892 1108 9551 Password - type the number equal to rk(H^2((S^1)^{200};Z))
Tomasz Maszczyk (UW)
The Hochschild cohomology for abstract convexity and the Shannon entropy
The Shannon entropy was introduced as a statistical measure of the information loss but appears in other fields of mathematics as well. We will start from the survey of the Faddeev algebraic characterization theorem and the fundamental information functional equation after Tverberg, Kendall, Lee. Ne...
