Zigzag and central circuit structure of two-faced plane graphs

author: Michel-Marie Deza, École Normale Supérieure (ENS)
published: Sept. 7, 2007,   recorded: September 2007,   views: 170

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Description

A zigzag in a k-valent plane graph G is a circuit of edges, such that any two, but not three consecutive edges belong to the same face. A railroad in G is a circuit of evengonal faces, such that any face is adjacent to its neighbors on opposite edges. Boundary circuits of a railroad are two ”parallel” zigzags if k = 3, or, in a 4-valent graph, two such central circuits. We consider the zigzag and railroad structure of two-faced 3- and 4-valent plane graphs (generalizations of Platonic polyhedra) and their connections with other problems.

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