Tighter Bounds on Directed Ramsey Number R(7)
Tighter Bounds on Directed Ramsey Number R(7)
复制标题
定向拉姆齐数 R(7) 的更严格界限
DOI:
10.1007/s00373-022-02560-5
复制
发表时间:
2022
影响因子:
0.7
通讯作者:
Heule, Marijn
中科院分区:
文献类型:
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作者:
Neiman, David;Mackey, John;Heule, Marijn
Tournaments are orientations of the complete graph. The directed Ramsey numberR(k) is the minimum number of vertices a tournament must have to be guaranteed to contain a transitive subtournament of sizek, which we denote by. We include a computer-assisted proof of a conjecture by Sanchez-Flores in Graphs Combinatorics14(2), 181–200 (1998), that all-free tournaments on 24 and 25 vertices are subtournaments of, the unique largest-free tournament. We also classify all-free tournaments on 23 vertices. We use these results, combined with assistance from a SAT solver, to obtain the following improved bounds onR(7):.
DOI:
10.1137/18m1169473
发表时间:
2017-04
期刊:
SIAM J. Discret. Math.
影响因子:
--
作者:
Bernard Lidick'y;Florian Pfender
通讯作者:
Bernard Lidick'y;Florian Pfender
DOI:
--
发表时间:
2022
期刊:
Proceedings of the 22nd Conference on Formal Methods in Computer-Aided Design – FMCAD 2022
影响因子:
--
作者:
Lohn, Evan;Lambert, Chris;Heule, Marijn J.
通讯作者:
Heule, Marijn J.