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Wydział Matematyki, Informatyki i Mechaniki Uniwersytetu Warszawskiego

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Seminarium „Topologia algebraiczna”

Cotygodniowe seminarium badawcze


Lista referatów

  • 2019-05-28, godz. 16:15, 3180

    Genevieve Walsh (Tufts University)

    Incoherence of many free by free groups

    A group is coherent if every finitely generated subgroup is finitely presented. Free by cyclic groups are known to be coherent by work of Feighn and Handel. We show that many free by free groups (where the free groups have rank at least 2) are incoherent. Our techniques use fibrations of the group. ...

  • 2019-05-07, godz. 16:15, 3180

    Mahan Mj (Tata Institute of Fundamental Research)

    Coarse Extrinsic Geometry and surface-by-free groups

    JOINT WITH SIMONS SEMESTER The notion of distortion of finitely generated subgroups H of finitely generated groups G, introduced by Gromov, is a first step towards studying extrinsic geometry of subgroups in the coarse setup. When the group and subgroup are hyperbolic, finer information can be ...

  • 2019-04-30, godz. 16:15, 3180

    Marcin Sabok (McGill University, IMPAN)

    On a conjecture of Gardner

    JOINT WITH SIMONS SEMESTER In 1925, Tarski asked if a disc in the plane and a square of the same area are equidecomposable, i.e. if the disc can be partitioned into finitely many pieces which can be rearranged by isometries of the plane to form a square. In 1990, Laczkovich showed that Tarski&...

  • 2019-04-16, godz. 16:15, 4070

    Michael W. Davis (Ohio State University)

    The action dimension of a discrete group

    Colloquim joint with Simons Semester A space is called a K(G,1) if its fundamental group is G and if its universal cover is contractible.  The geometric  dimension of G is the smallest dimension of a model for K(G,1) by a cell complex.  Its action dimension is the smallest dimension ...

  • 2019-04-02, godz. 16:15, 3180

    Pierre Pansu (Universite Paris-Sud)

    Aspects of geometric group theory: growth, isoperimetry, Lp-cohomology

    SIMONS SEMESTER COLLOQUIUM The growth and isoperimetry of finitely generated groups have been among its early interests. We shall show how they lead to today’s cohomological methods, notions of negative curvature and rigidity problems. https://www.impan.pl/en/activities/banach-center/confere...

  • 2019-03-26, godz. 16:15, 4070

    Michał Lech (MIMUW)

    Grupa monodromii osobliwości i automorfizmy diagramów Dynkina

  • 2019-02-26, godz. 16:15, 4070

    Grzegorz Banaszak (UAM)

    Algebraic Sato-Tate group for motives

    In my talk I will explain the notion of equidistibution, in particular the Sato-Tate conjecture concerning the equidistribution of Frobenius elements in l-adic representations. In particular  I will show how to apply the motivic Galois group to construct Algebraic Sato-Tate  group to study...

  • 2019-01-22, godz. 16:15, 4070

    Rafał Lutowski (UG)

    Spin struktury płaskich rozmaitości typu diagonalnego

    Zaprezentujemy czysto kombinatoryczny opis klas Stiefela-Whitneya płaskich rozmaitości z diagonalną reprezentacją holonomii. Używając tego opisu, dla każdej liczby całkowitej d większej od 1 skonstruujemy orientowalną płaską rozmaitość z elementarną abelową grupą holonomii rangi d, ...

  • 2019-01-15, godz. 16:15, 4070

    Krzysztof Ziemiański (MiMUW)

    Od współbieżności do grup warkoczy

  • 2018-12-11, godz. 16:15, 4070

    Jan Spaliński (PW)

    Homologie Khovanov'a, ciąg dalszy

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