Number of faces of chord diagrams, maps, graphs, delta-matroids and permutations II, 15марта, Lando

Описание к видео Number of faces of chord diagrams, maps, graphs, delta-matroids and permutations II, 15марта, Lando

In this talk, permutations will be addressed more closely.

A combinatorial map (= embedded graph, = ribbon graph, = fat graph, = ...) has vertices, edges, and faces. It happens that for many other combinatorial structures we can enumerate vertices, edges, or faces even in the situations where we are unable to define them. These numbers play a crucial role in understanding weight systems, worth studying attentively

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