Geometric Topology Seminar: V. I. Zhukov

Dear all,

You are cordially invited to attend the next meeting of the Geometric Topology Seminar.

http://www.mathnet.ru/php/conference.phtml?confid=192

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Geometric Topology Seminar
Math Department of the Higher School of Economics (Usachyova, 6)
Room 108

[For external visitors, you may be required to present identification (such as a passport) at security. You are welcome to call Ash Lightfoot (+7 925 8897129) in the case of any difficulties.]

Thursday, May 17, 14:00

Speaker: Slava Zhukov

Title: Invariants of Hopf algebras of delta-matroids and of Hopf algebras of Lagrangian subspaces that satisfy four-term relations

Abstract:

In this talk I will continue the topic Alex Dunaykin spoke about. I will briefly recall the connections between Hopf algebras of chord diagrams, intersection graphs, ribbon (embedded) graphs and binary delta-matroids. I will give some examples of weight systems on the Hopf algebra of a delta-matroid. Then I will describe an isomorphism between the Hopf algebra of ribbon graphs and the Hopf algebra of Lagrangian subspaces.