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:
影响因子:
--
通讯作者:
Sun, Xiaorui
中科院分区:
文献类型:
--
作者:
Sun, Xiaorui
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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DOI:
--
发表时间:
2020
期刊:
IEEE Annual Symposium on Foundations of Computer Science
影响因子:
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作者:
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DOI:
--
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期刊:
arXiv.org
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DOI:
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发表时间:
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期刊:
ArXiv
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DOI:
10.1007/978-3-642-31594-7_5
发表时间:
2012
期刊:
ACM Transactions on Algorithms (TALG)
影响因子:
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通讯作者:
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