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1·A substance is through the primary transformation into an upper triangular matrix, the transformation matrix is a unit lower triangular matrix.

实质上是将A通过初等行变换变成一个上三角矩阵，其变换矩阵就是一个单位下三角矩阵。

2·This paper constructs irregular LDPC codes of unequal error protection with a parity check matrix in a lower triangular.

采用了近似下三角校验阵的形式，构造了一类具有不等错误保护的非规则ldpc码。

3·The name of it comes from the lower-triangular form of system matrix in state-space equations when it is linear.

这一名称来源于下三角结构线性系统写成状态空间表达式后，系统矩阵中所表现出的下三角形状；