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Seminarium „Topologia algebraiczna”

Cotygodniowe seminarium badawcze


Organizatorzy

Informacje

środy, 10:30 , sala: 4070

Strona domowa

http://duch.mimuw.edu.pl/~aweber/STA/

Dziedziny badań

Lista referatów

  • 26 października 2021 16:30
    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 dopuszczają taki rozkład, i …

  • 19 października 2021 16:30
    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 …

  • 12 października 2021 16:30
    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.  

  • 8 czerwca 2021 16:30
    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 …

  • 25 maja 2021 16:30
    Agnieszka Bodzenta (MIMUW)
    Ringel duality
    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 …

  • 18 maja 2021 16:30
    Adam Przeździecki (SGGW)
    Set-theoretic problems in constructing localizations
    https://www.mimuw.edu.pl/~aweber/STA/AP-lokalizacja.pdf

  • 11 maja 2021 16:30
    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 …

  • 27 kwietnia 2021 16:30
    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

  • 20 kwietnia 2021 16:30
    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 …

  • 13 kwietnia 2021 16:30
    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 …

  • 30 marca 2021 16:30
    Denis Nardin (Regensburg)
    Hermitian K-theory of rings
    The theory of quadratic and symmetric bilinear forms over rings has traditionally been more developed when 2 is invertible in the ring. In this talk we will present a new approach allowing to put some …

  • 23 marca 2021 16:30
    Tibor Macko (Slovak Academy of Sciences)
    Cobordisms of quadratic chain complexes
    A fundamental problem in surgery theory is to decide whether a given finite CW-complex X of dimension n>=5 satisfying Poincare duality is homotopy equivalent to a topological manifold. In the classical surgery theory due to …

  • 16 marca 2021 16:30
    Bruno Stonek (IMPAN)
    Tensors of Thom spectra with spaces: generalizing Mahowald's Thom isomorphism
    The topological Hochschild homology (THH) of a commutative ring spectrum R can be expressed as a tensor with a circle. More generally, one can tensor R with any space X. In this talk we will …

  • 9 marca 2021 16:30
    Patryk Jaśniewski (UW)
    Homological structure of the category of strict polynomial functors of prime degree p
    https://www.mimuw.edu.pl/~aweber/STA/21.03.09.pdf

  • 26 stycznia 2021 16:30
    Andrzej Szczepański (UG)
    Combinatorial Hantzsche-Wendt group
    Let n\in N. By a combinatorial Hantzsche-Wendt group we shall understand a finite presented group G_n = {x_1, ..., x_n  |  x_i^{-1} x_j^2 x_i x_j^2  \forall i\neq j}. During a talk I will present properties …