arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1903.08138math.CO
收藏

关于复合对策的Sprague-Grundy函数

On the Sprague-Grundy function of compound games

Endre Boros, Vladimir Gurvich, Levi Kitrossky, Kazuhisa Makino

摘要:

经典的{ \sc Nim}游戏可以自然地扩展到任意的超图$\cH \subseteq 2^V \setminus \{\emptyset\}$上,其顶点$V = \{1, \ldots, n\}$对应于一堆石头。通过一次移动,玩家选择$\cH$的边$H$,并任意减少所有的桩$i \in H$。在1901年布顿解决了经典的{ \sc尼姆}为其中$\cH = \{\{1\}, \ldots, \{n\}\}$。在1910年摩尔介绍并解决了一个更一般的游戏$k$ -{ \sc尼姆},其中$\cH = \{H \subseteq V \mid |H| \leq k\}$,其中$1 \leq k < n$。在1980年,Jenkyns和Mayberry得到了摩尔{ \sc Nim}在$k+1 = n$情形下的Sprague-Grundy函数的显式公式。最近的研究表明,同样的公式适用于一大类超图。本文研究了这类超图的组合性质,得到了相应超图{ \sc Nim}对策的合取复合和选择复合的Sprague-Grundy函数的显式表达式.

英文摘要:

The classical game of {\sc Nim} can be naturally extended and played on an arbitrary hypergraph $\cH \subseteq 2^V \setminus \{\emptyset\}$ whose vertices $V = \{1, \ldots, n\}$ correspond to piles of stones. By one move a player chooses an edge $H$ of $\cH$ and reduces arbitrarily all piles $i \in H$. In 1901 Bouton solved the classical {\sc Nim} for which $\cH = \{\{1\}, \ldots, \{n\}\}$. In 1910 Moore introduced and solved a more general game $k$-{\sc Nim}, for which $\cH = \{H \subseteq V \mid |H| \leq k\}$, where $1 \leq k < n$. In 1980 Jenkyns and Mayberry obtained an explicit formula for the Sprague-Grundy function of Moore's {\sc Nim} for the case $k+1 = n$. Recently it was shown that the same formula works for a large class of hypergraphs. In this paper we study combinatorial properties of these hypergraphs and obtain explicit formulas for the Sprague-Grundy functions of the conjunctive and selective compounds of the corresponding hypergraph {\sc Nim} games.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑