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:
影响因子:
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通讯作者:
A. Drápal
中科院分区:
文献类型:
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作者:
A. Drápal
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.