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马休群与斯坦诺4-设计
引用本文:廖小莲,陈国华.马休群与斯坦诺4-设计[J].数学理论与应用,2008,28(1):97-100.
作者姓名:廖小莲  陈国华
作者单位:湖南人文科技学院数学系,湖南人文科技学院数学系 娄底,417000,娄底,417000
基金项目:湖南省自然科学基金(10471152)资助.
摘    要:讨论了马休群旗传递作用于斯坦诺4-设计上情况,得到了如下结论:设D=(X,B,I)是非平凡的斯坦诺4-设计,D的自同构群G旗传递地作用在D上。若G是几乎单群,则 i)Soc(G)不同构于单群:N=Mv,v=12,22,24和N=M11,v=12; ii)若N=M11,v=11,则D是一个斯坦诺4-(11,5,1)设计,且G△M11; iii)若N=M23,v=23,则D是一个斯坦诺4-(23,7,1)设计,且G△M23。

关 键 词:几乎单群  斯坦诺设计  旗传递  自同构群  马休群

Mathieu Groups and Steiner 4-Designs
Liao Xiaolian Chen Guohua.Mathieu Groups and Steiner 4-Designs[J].Mathematical Theory and Applications,2008,28(1):97-100.
Authors:Liao Xiaolian Chen Guohua
Affiliation:Liao Xiaolian Chen Guohua (Department of mathematics Hunan Institute of Humanities Science and Technology Loudi,417000)
Abstract:Mathieu groups acting flag - transitivly on the Steiner 4 - Designs was discussed, and the following result was obtained:Let D = (X, B, I) be a non - trivial Steiner 4 - design,and G be a flag- transitive automorphism group of D,if G is almost simple type, then
i) Sot(G) is not isomorphic to N= Mv,v= 12,22,24 and N= M11,v= 12;
ii) If N = M11, v = 11, then D is Steiner 4 - ( 11,5,1 ) design, and G △ M11;
iii)If N= M23 ,v = 23,then D is a Steiner 4- (23,7,1) design, and G △M23.
Keywords:Mathieu groups Steiner design flag-transitive automorphism g roup almost simple type group
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