2-universality in Randomly Perturbed Graphs
2-universality in Randomly Perturbed Graphs
复制标题
2-随机扰动图中的普遍性
DOI:
10.1016/j.ejc.2020.103118
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Olaf Parczyk
中科院分区:
文献类型:
--
作者:
Olaf Parczyk
A graph G is called universal for a family of graphs F if it contains every element F∈ F as a subgraph. Let F (n, 2) be the family of all graphs with maximum degree 2. Ferber et al.(2019) proved that there exists a C such that for p≥ C (n− 2∕ 3 log 1∕ 3 n) the random graph G (n, p) aas is F (n, 2)-universal, which is asymptotically optimal. For any n-vertex graph G α with minimum degree δ (G α)≥ α n Aigner and Brandt (1993) proved that G α is F (n, 2)-universal if α≥ 2∕ 3 (and this is optimal). In this note, we consider the model of randomly perturbed graphs, which is the union G α∪ G (n, p). We prove that aas G α∪ G (n, p) is F (n, 2)-universal provided that α∈(0, 1) and p= ω (n− 2∕ 3). This is asymptotically optimal and improves on both results from above in the respective parameter. Furthermore, this extends a result of Böttcher et al.(in press), who embed a given F∈ F (n, 2) at these values. We also prove variants with universality for the family F ℓ (n, 2), all graphs from F (n, 2) with girth at least ℓ. For example, there exists an ℓ 0 depending only on α such that for all ℓ≥ ℓ 0 already p= ω (1∕ n) is sufficient for F ℓ (n, 2)-universality.
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DOI:
10.1016/j.jctb.2019.12.005
发表时间:
2020
期刊:
Series B
影响因子:
--
作者:
Han, Jie;Zhao, Yi
通讯作者:
Zhao, Yi
DOI:
10.1017/s0963548320000231
发表时间:
2020
期刊:
Combinatorics, Probability and Computing
影响因子:
--
作者:
Das S
通讯作者:
Das S
影响因子:
1
作者:
Böttcher J
通讯作者:
Böttcher J
DOI:
10.1017/s0963548318000366
发表时间:
2018
期刊:
Combinatorics, Probability and Computing
影响因子:
--
作者:
BALOGH J
通讯作者:
BALOGH J
影响因子:
1
作者:
F. Joos;J. Kim
通讯作者:
J. Kim