The Rabin index of parity games: Its complexity and approximation
The Rabin index of parity games: Its complexity and approximation
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平价游戏的拉宾指数:其复杂性和近似值
DOI:
10.1016/j.ic.2015.06.005
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发表时间:
2015
影响因子:
1
通讯作者:
Huth M
中科院分区:
文献类型:
--
作者:
Huth M
We study the descriptive complexity of parity games by taking into account the coloring of their game graphs whilst ignoring their ownership structure. Colored game graphs are identified if they determine the same winning regions and strategies, for all ownership structures of nodes. The Rabin index of a parity game is the minimum of the maximal color taken over all equivalent coloring functions. We show that deciding whether the Rabin index is at least k is in PTIME for k=1 but NP-hard for all fixed k > 1. We present an EXPTIME algorithm that computes the Rabin index by simplifying its input coloring function. When replacing simple cycle with cycle detection in that algorithm, its output over-approximates the Rabin index in polynomial time. Experimental results show that this approximation yields good values in practice.
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