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Sino-Russian Mathematics Center-JLU Colloquium(2023-001)—Subalgebras of free algebras

Posted: 2023-03-13   Views: 

Report Title:Subalgebras of free algebras

Reporter:Vladimir Dotsenko

Institution:University of Strasbourg

Time:January,5,2023 16:00-18:00

Location:ZOOM Id:904 645 6677,Password:2023

Meeting link:https://us02web.zoom.us/j/9046456677?pwd=UHErd3RJVzFsNzNnczFZYm9uYlV6QT09


Abstract : A classical result going back to works of Shirshov and Witt in 1950s states that every subalgebra of the free Lie algebra is free. Understanding what makes a variety of algebras satisfy this property has been an important open question in ring theory, recorded, for instance, in the Dniester Notebook. I shall talk about a recent work with Ualbai Umirbaev in which we developed a method that allowed us to exhibit infinitely many varieties of algebras (with one binary operation) satisfying this property; prior to our work, only six such varieties had been known. One surprising consequence of our work is that for the variety of all right-symmetric algebras subalgebras of free algebras are free.


Introduction of the Reporter:Vladimir Dotsenko is a professor at the University of Strasbourg, France. His work applies ideas of category theory to concrete questions of algebra, combinatorics, geometry and topology.