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arXiv 2306.07232math.CO
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不可分解的组合博弈

Indecomposable combinatorial games

Michael Fisher, Neil A. McKay, Rebecca Milley, Richard J. Nowakowski, Carlos P. Santos

AI总结:

该研究针对组合博弈论中短博弈形式的不可分解性问题,刻画了不可分解尼姆数和不可分解超实数的判定条件,明确了尼姆数不可分解等价于大小为2的幂、数不可分解等价于绝对值不大于1的结论。

摘要:

在组合博弈论中,短博弈形式是基于两名玩家可移动到的所有位置递归定义的。若一个博弈形式可表示为两个生日更小的博弈形式的析取和,则称它是可分解的;若不存在这样的求和项,则该博弈形式是不可分解的。本文的主要贡献是刻画了不可分解的nimber(尼姆数)与不可分解的数(surreal number,超实数)。更确切地说,一个尼姆数不可分解当且仅当它的大小是2的幂,一个数不可分解当且仅当它的绝对值小于或等于1。

英文摘要:

In Combinatorial Game Theory, short game forms are defined recursively over all the positions the two players are allowed to move to. A form is decomposable if it can be expressed as a disjunctive sum of two forms with smaller birthday. If there are no such summands, then the form is indecomposable. The main contribution of this document is the characterization of the indecomposable nimbers and the characterization of the indecomposable numbers. More precisely, a nimber is indecomposable if and only if its size is a power of two, and a number is indecomposable if and only if its absolute value is less or equal than one.

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。

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