A Faster Algorithm for Finding Tarski Fixed Points

A Faster Algorithm for Finding Tarski Fixed Points
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一种更快的找到 Tarski 不动点的算法

DOI:
10.1145/3524044
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发表时间:
2020
期刊:
ACM Transactions on Algorithms (TALG)
影响因子:
--
通讯作者:
Rahul Savani
Rahul Savani
中科院分区:
--
文献类型:
--
作者:
John Fearnley;Rahul Savani

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党等人。给出了一种算法,可以使用 O(log k n) 查询在宽度为 n 的 k 维晶格中找到 Tarski 不动点 [2]。多位作者推测该算法是最优的 [2, 7],并且事实上这已经针对二维实例得到了证明 [7]。我们通过给出三维 Tarski 问题的 O(log2 n) 查询算法来证明这些猜想在三维或更高维度上是错误的。我们还给出了 k 维 Tarski 问题的新分解定理,结合我们的三维新算法,给出了 k 维问题的 O(log2 ⌈k/3⌉ n) 查询算法。
Dang et al. have given an algorithm that can find a Tarski fixed point in a k-dimensional lattice of width n using O(log k n) queries [2]. Multiple authors have conjectured that this algorithm is optimal [2, 7], and indeed this has been proven for two-dimensional instances [7]. We show that these conjectures are false in dimension three or higher by giving an O(log2 n) query algorithm for the three-dimensional Tarski problem. We also give a new decomposition theorem for k-dimensional Tarski problems which, in combination with our new algorithm for three dimensions, gives an O(log2 ⌈k/3⌉ n) query algorithm for the k-dimensional problem.
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DOI: 10.4230/lipics.itcs.2020.18
发表时间: 2020
期刊: 11th Innovations in Theoretical Computer Science Conference
影响因子: --
作者:
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发表时间: 2019
影响因子: --
作者:
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