ACYCLIC EDGE-COLORING OF PLANAR GRAPHS

被引:34
|
作者
Basavaraju, Manu [1 ]
Chandran, L. Sunil [1 ]
Cohen, Nathann [2 ,3 ]
Havet, Frederic [2 ,3 ]
Mueller, Tobias [4 ]
机构
[1] Indian Inst Sci, Comp Sci & Automat Dept, Bangalore 560012, Karnataka, India
[2] UNSA, CNRS, I3S, Projet Mascotte, F-06902 Sophia Antipolis, France
[3] INRIA, F-06902 Sophia Antipolis, France
[4] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Math, IL-69978 Tel Aviv, Israel
关键词
edge-coloring; planar graphs; bounded density graphs; CHROMATIC NUMBER;
D O I
10.1137/090776676
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
A proper edge-coloring with the property that every cycle contains edges of at least three distinct colors is called an acyclic edge-coloring. The acyclic chromatic index of a graph G, denoted. chi'(alpha)(G), is the minimum k such that G admits an acyclic edge-coloring with k colors. We conjecture that if G is planar and Delta(G) is large enough, then chi'(alpha) (G) = Delta (G). We settle this conjecture for planar graphs with girth at least 5. We also show that chi'(alpha) (G) <= Delta (G) + 12 for all planar G, which improves a previous result by Fiedorowicz, Haluszczak, and Narayan [Inform. Process. Lett., 108 (2008), pp. 412-417].
引用
收藏
页码:463 / 478
页数:16
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