An algorithmic framework for obtaining lower bounds for random Ramsey problems
An algorithmic framework for obtaining lower bounds for random Ramsey problems
复制标题
用于获得随机拉姆齐问题下界的算法框架
DOI:
10.1016/j.jctb.2016.12.007
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
A. Steger
中科院分区:
文献类型:
--
作者:
R. Nenadov;Y. Person;N. Skoric;A. Steger
In this paper we introduce a general framework for proving lower bounds for various Ramsey type problems within random settings. The main idea is to view the problem from an algorithmic perspective: we aim at providing an algorithm that finds the desired coloring with high probability. Our framework allows to reduce the probabilistic problem of whether the Ramsey property at hand holds for random (hyper)graphs with edge probabilitypto a deterministic question of whether there exists a finite graph that forms an obstruction.In the second part of the paper we apply this framework to address and solve various open problems. In particular, we extend the result of Bohman, Frieze, Pikhurko and Smyth (2010) for bounded anti-Ramsey problems in random graphs to the case of 2 colors and to hypergraph cliques. As a corollary, this proves a matching lower bound for the result of Friedgut, Rödl and Schacht (2010) and, independently, Conlon and Gowers (2016) for the classical Ramsey problem for hypergraphs in the case of cliques. Finally, we provide matching lower bounds for a proper-coloring version of anti-Ramsey problems introduced by Kohayakawa, Konstadinidis and Mota (2014) in the case of cliques and cycles.
DOI:
10.19086/da.615
发表时间:
2016
期刊:
arXiv: Combinatorics
影响因子:
--
作者:
Ehud Friedgut; Hiêp Hàn;Yury Person;Mathias Schacht
通讯作者:
Mathias Schacht
DOI:
10.1017/fms.2017.22
发表时间:
2017
期刊:
Forum of Mathematics, Sigma
影响因子:
--
作者:
Luca Gugelmann;Rajko Nenadov;Yury Person;Nemanja Skorić;Angelika Steger;Henning Thomas
通讯作者:
Henning Thomas