Invertible linear maps on Borel subalgebras preserving zero Lie products

Invertible linear maps on Borel subalgebras preserving zero Lie products
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保留零李积的 Borel 子代数上的可逆线性映射

DOI:
10.1016/j.jalgebra.2014.02.023
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发表时间:
2014-05
期刊:
影响因子:
0.9
通讯作者:
Wang Dengyin(王登银)
Wang Dengyin(王登银)
中科院分区:
数学3区
文献类型:
--
作者:
Wang Dengyin(王登银)

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设g是特征为零的代数闭域上秩为l的单李代数,B是g的Borel子代数.称B上可逆线性映射φ在两个方向上保持零Lie积,如果对x,y∈ B,[x,y]= 0当且仅当[φ(x),φ(y)]= 0.本文证明了B上可逆线性映射φ在两个方向上都保持零Lie积的充要条件是它是内自同构、图自同构、标量乘映射和对角自同构的合成,从而将[8]中的主要结果从线性可解李代数推广到更一般的情形.
Let g be a simple Lie algebra of rank l over an algebraically closed field of characteristic zero, b a Borel subalgebra of g. An invertible linear map φ on b is said preserving zero Lie products in both directions if for x, y∈ b,[x, y]= 0 if and only if [φ (x), φ (y)]= 0. In this paper, it is shown that an invertible linear map φ on b preserving zero Lie products in both directions if and only if it is a composition of an inner automorphism, a graph automorphism, a scalar multiplication map and a diagonal automorphism, which extends the main result in [8] from a linear solvable Lie algebra to far more general cases.
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