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Pure Mathematics Seminars

All seminars will take place on Wednesday at 2 pm in Horton HLT1, unless stated otherwise. Here is a campus plan.Tea will be served after the seminar at 3pm in Room 237 of the McCrea  Building. All are welcome!

Autumn Term 2017

September 27: Alex Fink (Queen Mary) "Tutte characters for combinatorial bialgebras"

Abstract: In the forty years since Rota introduced it, the perspectiveon combinatorial objects through Hopf algebras has continued to growin productivity.  For one, Krajewski, Moffatt, and Tanasa found thatmany famous Tutte-like graph polynomials arise in a uniform fashionfrom the Hopf algebras formulated from various classes of topologicalgraph or their associated matroid-like structures.  With ClémentDupont and Luca Moci, we tried to understand _arithmetic matroids_ andthe convolution formula of Backman and Lenz for their Tutte polynomialin this fashion.  We found an obstruction in the lack of a(convincingly canonical) antipode, but managed to extend the theory tothe bialgebra case.  I'll explain.

October 4: Anitha Thillaisundaram (Lincoln) "On branch groups"

Abstract: Stemming from the Burnside problem, branch groups have delivered lots of exotic examples over the past 30 years. Among them are easily describable finitely generated torsion groups, as well as the first example of a finitely generated group with intermediate word growth. We will investigate a generalisation of the Grigorchuk-Gupta-Sidki branch groups and talk about their maximal subgroups and about their profinite completion. Additionally, we demonstrate a link to a conjecture of Passman on group rings. 

October 11: Sibylle Schroll (Leicester)

October 18: Rachel Newton (Reading)

October 25: Karin Bauer (Graz)

November 1: !!Starting at 13.50 in ABLT1!! Aurelien Galateau (Besancon)

November 8: Gareth Jones (Manchester)

November 15: Alison Parker (Leeds)

November 22: Tim Browning (Bristol) "Diophantine equations: use and misuse"

Abstract: Integer solutions to polynomial equations have been studied since the dawn of time. In this talk I will discuss some of the surprising contexts that these equations arise, such as in quantum computing, before describing some recent work specific to cubic equations.

November 29: Simon Smith (Lincoln)

December 6: Xiaolei Wu (Bonn)



Previous Seminars


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