The exchangeable necessary and sufficient condition is given for a class upper triangular matrixes, and out of it, we have got a simple method of obtaining inverse matrixes.
给出了一类上三角形矩阵可交换的充要条件，并由此得到了求其逆矩阵的一种简便方法。
The exchangeable necessary and sufficient condition is given for a class upper triangular matrixes, and out of it, we have got a simple method of obtaining inverse matrixes.
给出了一类上三角形矩阵可交换的充要条件，并由此得到了求其逆矩阵的一种简便方法。
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