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首页> 外文期刊>Journal of algebra and its applications >Automorphisms of the co-maximal ideal graph over matrix ring
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Automorphisms of the co-maximal ideal graph over matrix ring

机译:矩阵环的共同最大理想图的自体态

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Let Fq be a finite field with q elements, R0 = Mn(Fq) be the ring of all n × n matrices over Fq, L(R0) be the set of all nontrivial left ideals of R0. The co-maximal ideal graph of R0, denoted by C(R0), is a graph with L(R0) as vertex set and two nontrivial left ideals I,J of R0 are adjacent if and only if I + J = R0. If n = 2, it is easy to see that C(R0) is a complete graph, thus any permutation of vertices of C(R0) is an automorphism of C(R0). A natural problem is: How about the automorphisms of C(R0) when n ≥ 3. In this paper, we aim to solve this problem. When n ≥ 3, a mapping σ on L(R0) is proved to be an automorphism of C(R0) if and only if there is an invertible matrix x ∈ R0 and a field automorphism f of Fq such that σ(I) = f(I)x for any I ∈ L(R0), where f(I)x = {f(z)x?|?z ∈ I} and f(z) = [f(zij)]n×n for z = [zij]n×n ∈ R0.
机译:让FQ是具有Q元素的有限字段,R0 = Mn(FQ)是FQ,L(R0)的所有N×N矩阵的环,L(R0)是R0的所有非牵引理想集。 由C(R0)表示的R0的共同最大理想曲线图是具有L(R0)的曲线图,作为顶点组,并且r0的两个非增长左理想I,j of r0且仅当i + j = r0时是相邻的。 如果n = 2,则易于看出C(R0)是一个完整的图形,因此C(R0)的任何置换是C(R0)的自动形态。 一个自然问题是:当N≥3时,C(R0)的自同一性如何。在本文中,我们的目标是解决这个问题。 当n≥3时,如果只有在FQ的可逆矩阵x∈R0和现场自动形态f的情况下,则证明L(R0)上的映射Σ(R0)是C(R0)的自动形式,使得σ(i)= f(i)x用于任何I≠l(r0),其中f(i)x = {f(z)x≤1×|αz∈I}和f(z)= [f(zij)] n×n z = [zij] n×n∈r0。

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