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arXiv 1311.0293cs.CC
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用于树评估的Pebbling参数

Pebbling Arguments for Tree Evaluation

David Liu

摘要:

树评价问题是由Cook等人在2010年引入的,作为将P与L和NL分离的候选问题。树评估问题中已知的最一般的空间下界需要对分支程序进行语义限制,并使用与著名的卵石游戏的连接来生成瓶颈参数。这些界限满足相应的上限产生的自然实现的最佳卵石算法。在本文中,我们将这些想法扩展到各种限制家庭的确定性和非确定性分支程序,证明紧下界下,这些限制模型。我们还调查和统一已知的下限在我们的“鹅卵石论证”框架。

英文摘要:

The Tree Evaluation Problem was introduced by Cook et al. in 2010 as a candidate for separating P from L and NL. The most general space lower bounds known for the Tree Evaluation Problem require a semantic restriction on the branching programs and use a connection to well-known pebble games to generate a bottleneck argument. These bounds are met by corresponding upper bounds generated by natural implementations of optimal pebbling algorithms. In this paper we extend these ideas to a variety of restricted families of both deterministic and non-deterministic branching programs, proving tight lower bounds under these restricted models. We also survey and unify known lower bounds in our "pebbling argument" framework.

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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