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arXiv 1202.4597math.CO
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欧几里得的一个限制

A restriction of Euclid

Grant Cairns, Nhan Bao Ho

摘要:

欧几里得是一个著名的两人公平组合博弈。欧几里德中的一个位置是一对正整数,玩家通过从另一个整数中减去一个整数的正整数倍数来交替移动,而不会使结果为负。走到最后一步的玩家获胜。有一个变化的欧几里德由于格罗斯曼在游戏停止时,两个主菜是平等的。我们研究了一个进一步的变化,我们称之为M-欧几里德,其中游戏停止时,主菜之一是正整数倍的其他。我们解决了M-欧几里德的Sprague-Grundy函数,并比较了三个游戏的Sprague-Grundy函数。

英文摘要:

Euclid is a well known two-player impartial combinatorial game. A position in Euclid is a pair of positive integers and the players move alternately by subtracting a positive integer multiple of one of the integers from the other integer without making the result negative. The player who makes the last move wins. There is a variation of Euclid due to Grossman in which the game stops when the two entrees are equal. We examine a further variation that we called M-Euclid in which the game stops when one of the entrees is a positive integer multiple of the other. We solve the Sprague-Grundy function for M-Euclid and compare the Sprague-Grundy functions of the three games.

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