Faster Isomorphism for ?-Groups of Class 2 and Exponent ?

Faster Isomorphism for ?-Groups of Class 2 and Exponent ?
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2 类和指数的 ?-群的更快同构?

DOI:
10.1145/3564246.3585250
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发表时间:
2023
期刊:
ACM
影响因子:
--
通讯作者:
Sun, Xiaorui
Sun, Xiaorui
中科院分区:
--
文献类型:
--
作者:
Sun, Xiaorui

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群同构问题决定了由凯莱表给出的两个群是否同构。对于阶数为n的群,Tarjan在20世纪70年代提出了一个运行时间为n(logn+O(1))的算法(米勒,STOC 1978)。尽管在过去的几十年中进行了广泛的研究,但目前最好的群同构算法的运行时间为ann(1 / 4 +o(1))logn(Rosenbaum 2013)。(幂零)类2和指数p的p-群的同构测试已被确定为获得群同构问题的anno(logn)时间算法的主要障碍。虽然2类p-群和指数p-群的代数结构比一般群简单得多,但该类p-群的同构判定算法的运行时间也是O(logn),本文给出了2类p-群和指数p-群的同构判定算法,对任意素数p> 2,其运行时间为O((logn)5/6).我们的结果是基于对反对称矩阵元组等距问题的一种新的简化(Ivanyos和Qiao,SIAM J. Computing,2019)。为了获得减少,我们开发了几种工具,矩阵空间分析,包括矩阵空间个性化细化方法和低秩矩阵空间的表征。
The group isomorphism problem determines whether two groups, given by their Cayley tables, are isomorphic. For groups with ordern, an algorithm withn(logn+O(1))running time, attributed to Tarjan, was proposed in the 1970s (Miller, STOC 1978). Despite the extensive study over the past decades, the current best group isomorphism algorithm has ann(1 / 4 +o(1))lognrunning time (Rosenbaum 2013).The isomorphism testing forp-groups of (nilpotent) class 2 and exponentphas been identified as a major barrier to obtaining anno(logn)time algorithm for the group isomorphism problem. Although thep-groups of class 2 and exponentphave much simpler algebraic structures than general groups, the best-known isomorphism testing algorithm for this group class also has annO(logn)running time.In this paper, we present an isomorphism testing algorithm forp-groups of class 2 and exponentpwith running timenO((logn)5/6)for any primep> 2. Our result is based on a novel reduction to the skew-symmetric matrix tuple isometry problem (Ivanyos and Qiao, SIAM J. Computing, 2019). To obtain the reduction, we develop several tools for matrix space analysis, including a matrix space individualization-refinement method and a characterization of the low rank matrix spaces.
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