Autor:	Alexander Mednykh
Rok vydání:	2022
Předmět:	Mathematics::Algebraic Geometry
Zdroj:	Contemporary Mathematics. :301-309
ISSN:	1098-3627 0271-4132
Popis:	The aim of this paper is to present a few versions of the Riemann-Hurwitz formula for a regular branched covering of graphs. By a graph, we mean a finite connected multigraph. The genus of a graph is defined as the rank of the first homology group. We consider a finite group acting on a graph, possibly with fixed and invertible edges, and the respective factor graph. Then, the obtained Riemann-Hurwitz formula relates genus of the graph with genus of the factor graph and orders of the vertex and edge stabilizers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7b2151179a8dc4b969ef6a0346a775e1 https://doi.org/10.1090/conm/776/15618 Zobrazit plný text záznamu