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芯片射击游戏的结构和相关模型

The structure of Chip Firing Games and related models

Eric Goles, Michel Morvan, Ha Duong Phan

摘要:

本文研究了沙粒在沙堆中下落的动力学问题。通常沙堆的特点是由一个递减的整数分区和颗粒运动描述的过渡,这样的分区之间。我们在这里研究四个主要的过渡规则。由Brylawski(1973)引入的更经典的一种方法在给定整数n的递减划分之间引入了一种格结构$L_B (n)$(称为支配序)。我们证明了一个更严格的转移规则,称为SPM规则,诱导L_B(n)的子序的自然划分,每一个关联到一个不动点的SPM规则。在第二部分中,我们以一种自然的方式扩展了SPM规则,得到了一个称为芯片发射游戏的模型(Goles和Kiwi,1993)。我们证明了这个新的模型有有趣的性质:诱导阶是一个格,一个自然的拟阵可以与模型相关联,它也定义了一个强收敛的游戏。在最后一节中,我们用另一种方法推广了SPM规则,得到了另一种由t:L(n,t)参数化的格结构,它对-n+2 <= t <= n构成一个递减的格序列。对每个t,我们刻画了L(n,t)的不动点,并给出了它的最大链长.我们还注意到L(n,-n+2)是n的所有合成的格。

英文摘要:

In this paper, we study the dynamics of sand grains falling in sand piles. Usually sand piles are characterized by a decreasing integer partition and grain moves are described in terms of transitions between such partitions. We study here four main transition rules. The more classical one, introduced by Brylawski (1973) induces a lattice structure $L_B (n)$ (called dominance ordering) between decreasing partitions of a given integer n. We prove that a more restrictive transition rule, called SPM rule, induces a natural partition of L_B (n) in suborders, each one associated to a fixed point for SPM rule. In the second part, we extend the SPM rule in a natural way and obtain a model called Chip Firing Game (Goles and Kiwi, 1993). We prove that this new model has interesting properties: the induced order is a lattice, a natural greedoid can be associated to the model and it also defines a strongly convergent game. In the last section, we generalize the SPM rule in another way and obtain other lattice structure parametrized by some t: L(n,t), which form for -n+2 <= t <= n a decreasing sequence of lattices. For each t, we characterize the fixed point of L(n,t) and give the value of its maximal sized chain's lenght. We also note that L(n,-n+2) is the lattice of all compositions of n.

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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