Ranking tournaments with no errors II: Minimax relation
Ranking tournaments with no errors II: Minimax relation
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无错误排名赛 II:Minimax 关系
DOI:
10.1016/j.jctb.2019.10.004
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Zhao Qiulan
中科院分区:
文献类型:
--
作者:
Chen Xujin;Ding Guoli;Zang Wenan;Zhao Qiulan
Abstract A tournament T=(V, A) is called cycle Mengerian (CM) if it satisfies the minimax relation on packing and covering cycles, for every nonnegative integral weight function defined on A. The purpose of this series of two papers is to show that a tournament is CM iff it contains none of four Möbius ladders as a subgraph; such a tournament is referred to as Möbius-free. In the first paper we have given a structural description of all Möbius-free tournaments, and have proved that every CM tournament is Möbius-free. In this second paper we establish the converse by using our structural theorems and linear programming approach.