Monochromatic paths and at most 2-coloured arc sets in edge-coloured tournaments

被引:13
|
作者
Galeana-Sánchez, H
Rojas-Monroy, R
机构
[1] Univ Nacl Autonoma Mexico, Inst Matemat, Mexico City 04510, DF, Mexico
[2] Univ Autonoma Estado Mexico, Fac Ciencias, Inst Literario, Toluca 50000, Edo Mexico, Mexico
关键词
kernel; kernel-perfect digraph; kernel by monochromatic paths; tournament; m-coloured tournament;
D O I
10.1007/s00373-005-0618-z
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We call the tournament T an m-coloured tournament if the arcs of T are coloured with m-colours. If v is a vertex of an m- coloured tournament T, we denote by xi(v) the set of colours assigned to the arcs with v as an endpoint. In this paper is proved that if T is an m- coloured tournament with |xi(v)| <= 2 for each vertex v of T, and T satisfies at least one of the two following properties ( 1) m not equal 3 or ( 2) m = 3 and T contains no C-3 ( the directed cycle of length 3 whose arcs are coloured with three distinct colours). Then there is a vertex v of T such that for every other vertex x of T, there is a monochromatic directed path from x to v.
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页码:307 / 317
页数:11
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