Abstract
In this paper we present further studies of recurrent configurations of chip-firing games on Eulerian directed graphs (simple digraphs), a class on the way from undirected graphs to general directed graphs. A computational problem that arises naturally from this model is to find the minimum number of chips of a recurrent configuration, which we call the minimum recurrent configuration (MINREC) problem. We point out a close relationship between MINREC and the minimum feedback arc set (MINFAS) problem on Eulerian directed graphs, and prove that both problems are NP-hard.
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This paper was partially sponsored by Vietnam Institute for Advanced Study in Mathematics (VIASM), the Vietnamese National Foundation for Science and Technology Development (NAFOSTED), Fondecyt Postdoctoral Project 3140527, and Nucleo Milenio Informacion y Coordinacion en Redes (ACGO).
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Perrot, K., Van Pham, T. Feedback Arc Set Problem and NP-Hardness of Minimum Recurrent Configuration Problem of Chip-Firing Game on Directed Graphs. Ann. Comb. 19, 373–396 (2015). https://doi.org/10.1007/s00026-015-0266-9
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DOI: https://doi.org/10.1007/s00026-015-0266-9