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arXiv 2107.07458cs.GT
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论奇偶博弈中SPE的复杂性

On the Complexity of SPEs in Parity Games

Léonard Brice, Marie van den Bogaard, Jean-François Raskin

摘要:

我们研究了在有限图上进行的具有奇偶目标的无限持续时间非零和多人博弈中与子博弈完美均衡(SPE)相关的问题的复杂性。我们提出了新的复杂性的结果,在文献中的差距。我们的技术是基于最近的特性的SPE在前缀独立的游戏,是接地的概念的要求和谈判,并根据该播放支持的SPE是完全符合的要求,这是最不固定点的谈判功能的播放。新的结果如下。首先,检查给定的需求是协商函数的不动点是NP完全问题。其次,我们证明了SPE约束存在问题是NP-完全的,这个问题以前被认为是ExpTime-easy和NP-hard的。第三,SPE约束存在性问题是固定参数易处理时,玩家的数量和颜色的参数。第四,决定某个需求是否是协商函数的最小不动点对于布尔层次的第二层是完全的。最后,SPE验证问题-即判定是否存在满足某个LTL公式的SPE所支持的策略的问题-是PSpace完全的,这个问题被称为ExpTime简单和PSpace困难。

英文摘要:

We study the complexity of problems related to subgame-perfect equilibria (SPEs) in infinite duration non zero-sum multiplayer games played on finite graphs with parity objectives. We present new complexity results that close gaps in the literature. Our techniques are based on a recent characterization of SPEs in prefix-independent games that is grounded on the notions of requirements and negotiation, and according to which the plays supported by SPEs are exactly the plays consistent with the requirement that is the least fixed point of the negotiation function. The new results are as follows. First, checking that a given requirement is a fixed point of the negotiation function is an NP-complete problem. Second, we show that the SPE constrained existence problem is NP-complete, this problem was previously known to be ExpTime-easy and NP-hard. Third, the SPE constrained existence problem is fixed-parameter tractable when the number of players and of colors are parameters. Fourth, deciding whether some requirement is the least fixed point of the negotiation function is complete for the second level of the Boolean hierarchy. Finally, the SPE-verification problem -- that is, the problem of deciding whether there exists a play supported by a SPE that satisfies some LTL formula -- is PSpace-complete, this problem was known to be ExpTime-easy and PSpace-hard.

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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