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Cohomology in algebra, geometry, physics and statistics

usually takes place every Wednesday at 11:30 AM Institute of Mathematics of ASCR, Žitná 25, Praha 1, konírna
Chair: Anton Galaev, Roman Golovko, Igor Khavkine, Alexei Kotov, Hong Van Le and Petr Somberg

In this seminar we shall discuss topics concerning constructions and applications of cohomology theory in algebra, geometry, physics and statistics. In particular we shall discuss in first four seminars the relations between vertex algebras and foliations on manifolds, Gelfand-Fuks cohomology on singular spaces, cohomology of homotopy Lie algebras. The expositions should be accessible for all participants.

Non-diffeomorphic Reeb foliations and modified Godbillon-Vey class

Anton Galaev
University Hradec Kralove
Wednesday, 18. March 2020 - 10:00 to 11:00
in Konirna seminar room of the front IM building, ground floor
The definition of the Reeb foliation depends upon two real functions satisfying certain conditions. All these foliations are pairwise homeomorphic and have trivial Godbillon-Vey class. We construct explicit examples of the Reeb foliations that are not diffeomorphic. For this purpose we show that a modified Godbillon-Vey class defined by Losik is non-trivial for some Reeb foliations and trivial for some other Reeb foliations. This characteristic class takes values in the second order frame bundle of the leaf space of the foliation. This is a joint work with Ya. Bazaikin and P. Gumenyuk.



Luigi Caputi
Institute of Informatics of the Czech Academy of Sciences, Praha
Wednesday, 25. March 2020 - 11:30 to 12:30
in konirna seminar room of the front IM building, ground floor

Koszul algebras and one-dependent random 0-1 sequences

Leonid Positselski
Wednesday, 1. April 2020 - 11:30 to 12:30
konirna seminar room in the front IM building, ground floor
Koszul algebras are a natural class of graded algebras with
quadratic relations, defined by a series of homological conditions.
To a Koszul algebra over a field with finite-dimensional components,
one can assign a one-dependent stochastic 0-1 sequence, which carries
information about the dimensions of the algebra's grading components.
... more


Denis Bashkirov
Wednesday, 8. April 2020 - 11:30 to Wednesday, 20. May 2020 - 12:30
Konirna Seminar room in IM front building, ground floor