Improved Upper Bounds for Finding Tarski Fixed Points

Improved Upper Bounds for Finding Tarski Fixed Points
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改进了查找 Tarski 不动点的上限

DOI:
10.1145/3490486.3538297
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发表时间:
2022
期刊:
Proceedings of the 23rd ACM Conference on Economics and Computation (EC ’22
影响因子:
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通讯作者:
Li, Yuhao
Li, Yuhao
中科院分区:
--
文献类型:
--
作者:
Chen, Xi;Li, Yuhao

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研究了在k维格网{1,...,n}k上寻找Tarski不动点的查询复杂性,改进了已有的O(LOG⌈2k/3⌉n)[7]的最佳上界,给出了一个查询复杂度为O(LOG⌈(k+1)/2⌉n)的新算法.这是基于关于Tarski不动点问题的一个较弱变量的一个新的分解定理,其中输入由一个单调函数f:[n]k→[n]k和一个单调符号函数b:[n]k→{-1,0,1}组成,目标是找到满足f(X)∈x和b(X)≼0或f(X)≤x和b(X)≽0的点x≥[n]k。
We study the query complexity of finding a Tarski fixed point over the k-dimensional grid {1,...,n}k. Improving on the previous best upper bound of O(log⌈2k/3⌉n)[7], we give a new algorithm with query complexity O(log⌈(k+1)/2⌉n). This is based on a novel decomposition theorem about a weaker variant of the Tarski fixed point problem, where the input consists of a monotone function f:[n]k→[n]k and a monotone sign function b:[n]k→ {-1,0,1} and the goal is to find a point x ∈ [n]k that satisfies either f(x) ≼ x and b(x) ≤ 0 or f(x) ≽ x and b(x) ≥ 0.
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