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发表于 2020-1-8 12:40:37 来自手机 | 显示全部楼层 |阅读模式
Let$ B$ be the subgroup of $G=GL_n(\mathbb{C})$ of invertible upper triangular matrices, and let $U\subset B$ be the set of upper triangular matrices with diagonal entries 1. Prove that $B=N(U)$ and that $B=N(B)$.
(Artin 7.6.2)

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