Partitions of graphs and multigraphs under degree constraints

Partitions of graphs and multigraphs under degree constraints
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度约束下图和多重图的划分

DOI:
10.1016/j.dam.2019.10.027
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发表时间:
2020-05
影响因子:
1.1
通讯作者:
许宝刚
许宝刚
中科院分区:
数学3区
文献类型:
--
作者:
宋佳磊;许宝刚

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设G是一个可能有多条边但没有环的图,令μ(G)为G的重数(它是一对顶点之间的边数中的最大值),并令s和t为两个非负整数。令 K 4− 为通过移除边从 K 4 获得的图,对于 i∈{1, 2},令 F i 为通过添加一条连接 C 5 的两个不相邻顶点的长度为 i 的路径从 C 5 获得的简单图。令 F={K 2, 3, K 4−, F 1, F 2},并令 H 为通过添加一个新顶点并将其连接到两个不同的顶点而从 K 4− 获得的简单图族。 K 4− 的顶点。在本文中,我们证明图 G 允许划分 (S, T),使得 δ (G [S])≥ s 且 δ (G [T])≥ t if,(1) s≥ 2,t≥ 2,并且 G 是一个简单图,其最小度至少为 s+ t− 1 并且没有 F 的元素作为子图;或者 (2) s≥ 1,t≥ 1,G 的阶数至少为 5,最小阶数至少为 s+ t+ 2 μ(G)− 2,并且 H 中没有元素作为子图。这些改进了一些早期的结果。
Let G be a graph which may have multiple edges but no loops, let μ (G) be the multiplicity of G (which is the maximum among the numbers of edges between a pair of vertices), and let s and t be two nonnegative integers. Let K 4− be the graph obtained from K 4 by removing an edge, for i∈{1, 2}, let F i be the simple graph obtained from C 5 by adding a path of length i joining two nonadjacent vertices of C 5. Let F={K 2, 3, K 4−, F 1, F 2}, and let H be the family of simple graphs obtained from K 4− by adding a new vertex and joining it to two distinct vertices of K 4−. In this paper, we show that a graph G admits a partition (S, T) such that δ (G [S])≥ s and δ (G [T])≥ t if,(1) s≥ 2, t≥ 2, and G is a simple graph with minimum degree at least s+ t− 1 and without elements of F as subgraphs; or (2) s≥ 1, t≥ 1, G has order at least 5, minimum degree at least s+ t+ 2 μ (G)− 2, and no elements of H as subgraphs. These improve a few earlier results.
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