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Weekly research seminar
List of talks
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Oct. 7, 2026, 10:30 a.m.
Greg Kuperberg (University of California, Davis)
The odd Vassiliev conjecture at four loops
I will outline a proof that odd Jacobi diagrams vanish up to four loops, extending a result of Moskovich and Ohtuski by one. The implication for topology is that Vassiliev invariants up to degree four …
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June 17, 2026, 10:30 a.m.
Jesse Cohen (Universität Hamburg)
Naturality of the border Heegard Floer homology
Heegaard Floer homology is a powerful invariant of closed 3-manifolds, characterized by its functorial behavior under cobordisms. Containing a vast amount of topological information, this theory is known, for instance, to detect the Thurston norm. …
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June 10, 2026, 10:30 a.m.
Józef Przytycki (George Washington University)
Moduły motkowe trójwymiarowych rozmaitości: osobista perspektywa: od wielomianu HOMFLYPT do wyznacznika kwazigrup. (Skein Modules of 3-Manifolds: The Personal Perspective; From HOMFLYPT polynomial to determinants of quasigroups.)
Skein modules, from their humble beginning in April 1987, grew into a mainstream branch of mathematics (even to MathSciNet). I will outline the path Skein Modules took, from my personal historical perspective. In greater detail, …
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June 3, 2026, 10:30 a.m.
Stefan Jackowski (MIM UW)
Twierdzenia o lokalizacji i uzupełnianiu w ekwiwariantnych teoriach kohomologii (Pół wieku po obronie pracy doktorskiej pod tym tytułem)
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May 13, 2026, 10:30 a.m.
Jakub Koncki (MIM UW)
Hierarchia osobliwości i degeneracji algebr (Hierarchy of singularities and degenerations of algebras)
I will present a partial order on the set of algebras of finite rank that arises from singularity theory. I will show that this order determines a degeneration partial order on the set of algebras …
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April 29, 2026, 10:30 a.m.
Marcin Lara (IM PAN)
Skondensowany typ homotopijny schematu (2) (On the condensed homotopy type of a scheme (2))
Grothendieck's étale fundamental group is one of the central objects of study in arithmetic geometry. It has a "higher" refinement: the Artin-Mazur-Friedlander étale homotopy type, which allows one to speak about higher homotopy groups of …
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April 22, 2026, 10:30 a.m.
Bruno Stonek (MIM UW)
Algebraic models for spaces (Algebraiczne modele przestrzeni)
I will give an (incomplete and revisionistic) account of the problem of algebraic models for spaces, recalling some of the basics of rational homotopy theory. I will then explain how we can extend these models …
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April 15, 2026, 10:30 a.m.
Marcin Lara (IM PAN)
On the condensed homotopy type of a scheme (Skondensowany typ homotopijny schematu)
Grothendieck's étale fundamental group is one of the central objects of study in arithmetic geometry. It has a "higher" refinement: the Artin-Mazur-Friedlander étale homotopy type, which allows one to speak about higher homotopy groups of …
