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Sibirskie Èlektronnye Matematicheskie Izvestiya [Siberian Electronic Mathematical Reports], 2020, Volume 17, Pages 637–646
DOI: https://doi.org/10.33048/semi.2020.17.042
(Mi semr1237)
 

Discrete mathematics and mathematical cybernetics

Vertex colourings of multigraphs with forbiddances on edges

A. N. Glebova, I. A. Pavlovb, K. A. Khadaevc

a Sobolev Institute of Mathematics, 4, Koptyuga ave., Novosibirsk, 630090, Russia
b Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia
c Higher School of Economics, 20, Myasnitskaya str., Moscow, 101000, Russia
References:
Abstract: We define and study a new class of vertex colourings of multigraphs, where some pairs of colours are forbidden on the edges of a multigraph. We say that a multigraph $G$ is (properly) $(m,r)$-colourable if for any given sets of $r$ forbidden pairs of colours on the edges of $G$ where exists a (proper) vertex $m$-colouring of $G$ that respects all forbidden pairs. We determine all (properly) $(m,r)$-colourable stars, all $(2,r)$-colourable multigraphs for each $r\ge 1$ and all $(m,r)$-colourable multighraphs, where $r$ is large enough (close to $m^2$). We also introduce a list version of $(m,r)$-colourability and establish (for the case of improper colourings) that the list $(m,r)$-colourability of a multigraph is equivalent to its $(m,r)$-colourability.
Keywords: graph, multigraph, edge, colouring, list colouring, forbiddance.
Funding agency Grant number
Russian Foundation for Basic Research 18-01-00353_a
18-01-00747_а
Received November 3, 2018, published April 24, 2020
Bibliographic databases:
Document Type: Article
UDC: 519.172.2, 519.174
MSC: 05C10, 05C15, 05C70
Language: Russian
Citation: A. N. Glebov, I. A. Pavlov, K. A. Khadaev, “Vertex colourings of multigraphs with forbiddances on edges”, Sib. Èlektron. Mat. Izv., 17 (2020), 637–646
Citation in format AMSBIB
\Bibitem{GlePavKha20}
\by A.~N.~Glebov, I.~A.~Pavlov, K.~A.~Khadaev
\paper Vertex colourings of multigraphs with forbiddances on edges
\jour Sib. \`Elektron. Mat. Izv.
\yr 2020
\vol 17
\pages 637--646
\mathnet{http://mi.mathnet.ru/semr1237}
\crossref{https://doi.org/10.33048/semi.2020.17.042}
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