# [其它题目] 求教抽代 群 一道课后习题，感谢！

 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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