pivot 是主元
已知U为上三角矩阵, 其主元位于对角线上
一般情况下, 主元指梯矩阵中非零行的首非零元
如 1 2 3 4
0 5 6 7
0 0 0 8
中的1,5,8
英语翻译例句：We already know U,the upper triangular matrix with th
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