Let R be a commutative ring with identity I and unit 2, Tn+1(R) the algebra of all upper triangular n+1 by n+1 matrices over R. In this article, we prove that any Jordan automorphism of Tn+1(R) can be uniquely written as a product of graph, inner and diagonal automorphisms.%设R是含单位元1和可逆元2的可换环,Tn+1(R)表示R上(n+1)×(n+1)级上三角矩阵全体所形成的矩阵代数.本文证明了Tn+1(R)的每一个若当自同构都可唯一的分解为图自同构,内自同构和对角自同构的乘积.
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