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**No polynomial bound for the chip firing game on directed graphs.**
*(English)*
Zbl 0758.05060

The chips game for general graphs was formulated by A. Björner, L. Lovász and P. W. Shor [Eur. J. Comb. 12, No. 4, 283-291 (1991; Zbl 0729.05048)]. For undirected graphs, G. Tardos [SIAM J. Discrete Math. 1, No. 3, 397-398 (1988; Zbl 0652.68089)] gave an upper limit, \(O(n^ 4)\), on the number of moves in a game for which the number of nodes is bounded by \(n\). In this note we prove that for directed graphs no polynomial bound on the number of moves exists. In fact, we give an example of a sequence of games with exponential growth.

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\textit{K. Eriksson}, Proc. Am. Math. Soc. 112, No. 4, 1203--1205 (1991; Zbl 0758.05060)

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### References:

[1] | A. Björner, L. Lovász, and P. Shor, Chip-firing games on graphs, preprint, 1987. · Zbl 0729.05048 |

[2] | Gábor Tardos, Polynomial bound for a chip firing game on graphs, SIAM J. Discrete Math. 1 (1988), no. 3, 397 – 398. · Zbl 0652.68089 |

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