This article gives a Formula for finding inverse matrices of upper (down) triangular matrix.

本文给出了上(下)三角形矩阵的一个求逆公式。

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The authors characterize the forms of additive invertable operators preserving inverse matrix of the upper triangular matrix space over a field which characteristic is not 2 or 3 .

刻划了特征不为2及3的域上的上三角矩阵空间保逆矩阵的可逆加法算子的形式。

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