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Kapcsolat
F-WORM colorings: Results for 2-connected graphs |
Tartalom: | http://real.mtak.hu/74269/ |
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Archívum: | MTA Könyvtár |
Gyűjtemény: |
Status = Published
Type = Article |
Cím: |
F-WORM colorings: Results for 2-connected graphs
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Létrehozó: |
BujtĂĄs, Csilla
Tuza, Zsolt
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Kiadó: |
Elsevier
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Dátum: |
2017
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Téma: |
QA166-QA166.245 Graphs theory / grĂĄfelmĂŠlet
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Tartalmi leírás: |
Given two graphs F and G, an F-WORM coloring of G is an assignment of colors to its vertices in such a way that no F-subgraph of G is monochromatic or rainbow. If G has at least one such coloring, then it is called F-WORM colorable and Wâ(G,F) denotes the minimum possible number of colors. Here, we consider F-WORM colorings with a fixed 2-connected graph F and prove the following three main results: (1) For every natural number k, there exists a graph G which is F-WORM colorable and Wâ(G,F)=k; (2) It is NP-complete to decide whether a graph is F-WORM colorable; (3) For each kâĽ|V(F)|â1, it is NP-complete to decide whether a graph G satisfies Wâ(G,F)â¤k. This remains valid on the class of F-WORM colorable graphs of bounded maximum degree. We also prove that for each nâĽ3, there exists a graph G and integers r and s such that sâĽr+2, G has Kn-WORM colorings with exactly r and also with s colors, but it admits no Kn-WORM colorings with exactly r+1,âŚ,sâ1 colors. Moreover, the difference sâr can be arbitrarily large. Š 2017 Elsevier B.V.
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Nyelv: |
angol
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Típus: |
Article
PeerReviewed
info:eu-repo/semantics/article
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Formátum: |
text
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Azonosító: |
BujtĂĄs, Csilla and Tuza, Zsolt (2017) F-WORM colorings: Results for 2-connected graphs. DISCRETE APPLIED MATHEMATICS, 231. pp. 131-138. ISSN 0166-218X
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Kapcsolat: |
https://doi.org/10.1016/j.dam.2017.05.008
MTMT:3279881; doi:10.1016/j.dam.2017.05.008
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