How far apart can the group multiplication tables be?

How far apart can the group multiplication tables be?
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群乘法表可以相距多远?

DOI:
10.1016/s0195-6698(05)80012-5
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发表时间:
1992
期刊:
European journal of combinatorics (Print)
影响因子:
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通讯作者:
A. Drápal
A. Drápal
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文献类型:
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作者:
A. Drápal

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设dist(G(·),G(*))= card{(a,B)εG2;a · B ε a*B},其中任意两个群G(·),G(*)具有相同的基础集,δ(G(·))= min dist(G(·),G(*)),其中G(*)穿过所有dist(G(·),G(*))≥ 0的群。对于任意n ∈ 51,δ(G(·))ε {6 n − 24,6 n − 20,6 n − 18}成立,n是G的阶。此外,当dist(G(·),G(*))<$n ~ 2/9时,群G(·)和G(*)同构.
Put dist(G(·),G(*)) = card{(a, b) εG2;a · b≠a*b} for any two groupsG(·),G(*) with the same underlying set andδ(G(·)) = min dist(G(·),G(*)), whereG(*) runs through all groups with dist(G(·),G(*)) ≠ 0. It holds thatδ(G(·)) ε {6n− 24, 6n− 20, 6n− 18} for anyn⩾ 51,nbeing the order ofG. Moreover, groupsG(·) andG(*) are isomorphic whenever dist(G(·),G(*)) ⩽n2/9.