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[期刊论文]

Generalization of transitive fraternal augmentations for directed graphs and its applications

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author:

Yang, D. (Yang, D..) [1]

Indexed by:

Scopus

Abstract:

Let over(G, →) be a directed graph. A transitive fraternal augmentation of over(G, →) is a directed graph over(H, →) with the same vertex set, including all the arcs of over(G, →) and such that for any vertices x, y, z, 1.if (x, y) ∈ E (over(G, →)) and (x, z) ∈ E (over(G, →)) then (y, z) ∈ E (over(H, →)) or (z, y) ∈ E (over(H, →)) (fraternity);2.if (x, y) ∈ E (over(G, →)) and (y, z) ∈ E (over(G, →)) then (x, z) ∈ E (over(H, →)) (transitivity). In this paper, we explore some generalization of the transitive fraternal augmentations for directed graphs and its applications. In particular, we show that the 2-coloring number col2 (G) ≤ O (∇1 (G) ∇0 (G)2), where ∇k (G) (k ≥ 0) denotes the greatest reduced average density with depth k of a graph G; we give a constructive proof that ∇k (G) bounds the distance (k + 1)-coloring number colk + 1 (G) with a function f (∇k (G)). On the other hand, ∇k (G) ≤ (col2 k + 1 (G))2 k + 1. We also show that an inductive generalization of transitive fraternal augmentations can be used to study nonrepetitive colorings of graphs. © 2009 Elsevier B.V. All rights reserved.

Keyword:

Directed graph; Generalized coloring number; Greatest reduced average density; Nonrepetitive coloring; Transitive fraternal augmentation

Community:

  • [ 1 ] [Yang, D.]Center for Discrete Mathematics, Fuzhou University, Fuzhou, Fujian 350002, China

Reprint 's Address:

  • [Yang, D.]Center for Discrete Mathematics, Fuzhou University, Fuzhou, Fujian 350002, China

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Source :

Discrete Mathematics

ISSN: 0012-365X

Year: 2009

Issue: 13

Volume: 309

Page: 4614-4623

0 . 5 4 8

JCR@2009

0 . 7 0 0

JCR@2023

JCR Journal Grade:3

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 6

30 Days PV: 0

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