A New Notion of Transitivity for Groups and Sets of Permutations

A New Notion of Transitivity for Groups and Sets of Permutations
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群和排列集传递性的新概念

DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
Bruce E. Sagan
Bruce E. Sagan
中科院分区:
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文献类型:
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作者:
W. Martin;Bruce E. Sagan

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设Ω={1,2,…,n}其中n⩾2.有序集划分的形状P=(P1,…,pk)是Ω的整数分区λ=(λ1,…,λk)由λi=|PI|定义。设G是作用于Ω的置换群。对于n的固定划分λ,如果当G作用于形状为λ的划分P时,G只有一个轨道,则称G是λ传递的。当G仅仅是一个集合时,也可以给出相应的定义。例如,如果λ=(n−t,1,…,1),则λ-传递群与t-传递置换群相同,且如果λ=(n−t,t),则恢复t-齐次置换群。
Let Ω = {1, 2, …, n} where n ⩾ 2. The shape of an ordered set partition P = (P1, …, Pk) of Ω is the integer partition λ = (λ1, …, λk) defined by λi = |Pi|. Let G be a group of permutations acting on Ω. For a fixed partition λ of n, we say that G is λ‐transitive if G has only one orbit when acting on partitions P of shape λ. A corresponding definition can also be given when G is just a set. For example, if λ = (n − t, 1, …, 1), then a λ‐transitive group is the same as a t‐transitive permutation group, and if λ = (n − t, t), then we recover the t‐homogeneous permutation groups.