A New Notion of Transitivity for Groups and Sets of Permutations
A New Notion of Transitivity for Groups and Sets of Permutations
复制标题
群和排列集传递性的新概念
DOI:
--
复制
发表时间:
2002
期刊:
影响因子:
--
通讯作者:
Bruce E. Sagan
中科院分区:
文献类型:
--
作者:
W. Martin;Bruce E. Sagan
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.