Alex Fink

Queen Mary University of London

Tutte characters for combinatorial coalgebras

Combinatorics Seminar

19th November 2019, 11:00 am – 12:00 pm
Fry Building, 2.04

The Tutte polynomial is a favourite invariant of matroids and graphs. So when
one is working in a generalisation of these settings, for example arithmetic
matroids or ribbon graphs, it is a tempting question to find a counterpart of
the Tutte polynomial; answers have been given in many cases. Our work unifies
these answers, providing general machinery to turn a combinatorial object with
"minor" operations into a coalgebra, and from that coalgebra extract the most
general possible Tutte-like invariant. We build on earlier work by Krajewski,
Moffatt, and Tanasa, who used Hopf algebras for this purpose.

Joint with Clément Dupont and Luca Moci.

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