The Complexity of Distributed Edge Coloring with Small Palettes
The Complexity of Distributed Edge Coloring with Small Palettes
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小调色板分布式边缘着色的复杂性
DOI:
10.1137/1.9781611975031.168
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Uitto, Jara
中科院分区:
文献类型:
--
作者:
Chang, Yi-Jun;He, Qizheng;Li, Wenzheng;Pettie, Seth;Uitto, Jara
The complexity of distributed edge coloring depends heavily on thepalette sizeas a function of the maximum degree Δ. In this paper we explore the complexity of edge coloring in the LOCAL model in different palette size regimes. Our results are as follows.We simplify theround eliminationtechnique of Brandt et al. [9] and prove that (2Δ – 2)-edge coloring requires Ω(logΔlogn) time w.h.p. and Ω(logΔn) time deterministically,even on trees. The simplified technique is based on two ideas: the notion of anirregular running time(in which network components terminate the algorithm at prescribed, but irregular times) and some general observations that transformweaklower bounds intostrongerones.We give a randomized edge coloring algorithm that can use palette sizes as small as , which is a natural barrier for randomized approaches. The running time of the algorithm is at mostO(log Δ ·TLLL), whereTLLLis the complexity of a permissive version of the constructive Lovász local lemma.We develop a new distributed Lovász local lemma algorithm fortree-structured dependency graphs, which leads to a (1 +∊)Δ-edge coloring algorithm for trees running inO(log logn) time. This algorithm arises from two new results: a deterministicO(logn)-time LLL algorithm for tree-structured instances, and a randomizedO(log logn)-timegraph shatteringmethod for breaking the dependency graph into independentO(logn)-size LLL instances.A natural approach to computing (Δ + 1)-edge colorings (Vizing's theorem) is to extend partial colorings by iteratively re-coloring parts of the graph, e.g., via “augmenting paths.” We prove that this approach may be viable, but in the worst case requires recoloring subgraphs of diameter Ω(Δ logn). This stands in contrast to distributed algorithms for Brooks’ theorem [32], which exploit the existence ofO(logΔn)-length augmenting paths.
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影响因子:
1.3
作者:
Kai-Min Chung;Seth Pettie;Hsin-Hao Su
通讯作者:
Kai-Min Chung;Seth Pettie;Hsin-Hao Su
DOI:
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发表时间:
1982
期刊:
影响因子:
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作者:
E. Arjomandi
通讯作者:
E. Arjomandi
影响因子:
1.6
作者:
Chang, Yi-Jun;Kopelowitz, Tsvi;Pettie, Seth
通讯作者:
Pettie, Seth
DOI:
--
发表时间:
1983
期刊:
--
影响因子:
--
作者:
通讯作者:
--
DOI:
--
发表时间:
1998
期刊:
Combinatorics, probability & computing
影响因子:
--
作者:
David A. Grable
通讯作者:
David A. Grable