The proof of a conjecture due to Snevily

The proof of a conjecture due to Snevily
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Snevilly猜想的证明

DOI:
10.1016/j.disc.2010.02.008
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发表时间:
2010-06
影响因子:
0.8
通讯作者:
高泽图
高泽图
中科院分区:
数学3区
文献类型:
--
作者:
尹建华;高泽图

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给定连通图G的顶点上的鹅卵石分布,G上的鹅卵石移动包括从一个顶点上取下两个鹅卵石,并将一个鹅卵石放置在相邻的顶点上。卵石数f(G)是最小的数m,使得对于每一个m个卵石的分布和每一个顶点v,一个卵石可以移动到v。一个图G被称为具有2-卵石性质,如果对于任何有超过2f(G)−q个卵石的分布,其中q是至少有一个卵石的顶点的数目,使用卵石移动,可以使两个卵石移动到任何顶点。没有2-pebbling性质的图称为Lemke图。Snevily and Foster(英语:Snevily and Foster)Snevily,J.A. Foster,The 2-pebbling property and a consumption of Graham's,Graphs and Combin. 16(2000),231-244]定义了一个可能的Lemke图的无限族{L1,L2,.},并证明了对于每个k,Lk是Lemke图.本文证明了这一猜想。
Given a distribution of pebbles on the vertices of a connected graph G, a pebbling move on G consists of taking two pebbles off one vertex and placing one on an adjacent vertex. The pebbling numberf(G) is the smallest number m such that, for every distribution of m pebbles and every vertex v, a pebble can be moved to v. A graph G is said to have the2-pebbling property if, for any distribution with more than 2f(G)−q pebbles, where q is the number of vertices with at least one pebble, it is possible, using pebbling moves, to get two pebbles to any vertex. A graph G without the 2-pebbling property is called a Lemke graph. Snevily and Foster [H.S. Snevily, J.A. Foster, The 2-pebbling property and a conjecture of Graham’s, Graphs and Combin. 16 (2000), 231–244] defined an infinite family {L1,L2,…} of possible Lemke graphs, and conjectured that Lkis a Lemke graph for each k. In this paper, we prove this conjecture.
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