Automorphisms of Grassmann graphs over a residue class ring
Automorphisms of Grassmann graphs over a residue class ring
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残基类环上格拉斯曼图的自同构
DOI:
10.1016/j.disc.2019.111693
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发表时间:
2020-04
影响因子:
0.8
通讯作者:
Wang Kaishun
中科院分区:
文献类型:
--
作者:
Huang Li-Ping;Lv Benjian;Wang Kaishun
Let Z p s be the residue class ring of integers modulo p s, where p is a prime number and s is a positive integer. The Grassmann graph over Z p s, denoted by G (n, m, p s), has the vertex set all m-subspaces of Z p s n (n> m≥ 1), and two vertices are adjacent if and only if their intersection is of dimension m− 1. We characterize the automorphisms of G (n, m, p s) as follows. Let n≥ 2 m≥ 4 and let φ∈ Aut (G (n, m, p s)). Then either φ (X)= X U for all X∈ V (G (n, m, p s)), or n= 2 m and φ (X)=(X U)⊥ for all X∈ V (G (2 m, m, p s)), where U is a fixed invertible matrix and (X U)⊥ is the dual subspace of X U. This result also extends Chow’s theorem for the geometry of Grassmann space.
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