Non-isomorphic 2-groups Coincide at Most in Three Quarters of their Multiplication Tables

Non-isomorphic 2-groups Coincide at Most in Three Quarters of their Multiplication Tables
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非同构 2 群至多在四分之三的乘法表中重合

DOI:
10.1006/eujc.1999.0347
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发表时间:
2000
期刊:
European journal of combinatorics (Print)
影响因子:
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通讯作者:
A. Drápal
A. Drápal
中科院分区:
--
文献类型:
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作者:
A. Drápal

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设G(?)G(*)是两个有限阶n的群,设d是集合{(a,B)?G×G;a?B?= a*B }。设P和Q是G(?)和G(*)。如果d小于n2/4,则存在同构:P吗?Q,并且P和Q的正规化子具有相同的阶。
Let G(?) and G(*) be two groups of the finite order n, and let d be the size of the set {(a, b) ?G×G;a?b?=a*b }. Let P and Q be Sylow 2-subgroups of G(?) and G(*), respectively. If d is less than n2/4, then there exists an isomorphism ?: P?Q, and the normalizers of P and Q have the same order.