lower triangular matrix [数] 下三角形矩阵 ; 下三角矩阵
unit lower triangular matrix 单位下三角阵
Lower triangular 下三角矩阵 ; 下三角形
strictly lower triangular matrix 严格下三角矩阵
lower triangular group [数] 下三角矩阵群
lower-triangular matrix 下三角形矩阵
lower triangular infinite matrix 下三角无穷矩阵
approximate lower triangular structure 近似下三角结构
lower-triangular form 下三角结构
Owing to the character of structure of lower-triangular system, the high-rank state of each differential equation is used as virtual control, then the control law is constructed by recursive design.
根据下三角系统的结构特点，将系统每个微分方程中的高阶状态用作虚拟控制进行设计，通过循环设计最终得到系统控制所需要的控制策略。
All the land tortoise species formed a tight cluster of points in the upper part of the triangle; all the water turtles cluster in the lower part of the triangular graph.
所有陆龟品种都在三角形的上部形成一个紧密的点群；所有的水龟都聚集在三角图的下方。
Conclusion. In most cases, the vertebral body shape is hemispherical in the upper part of the pedicle and triangular in the lower part of the pedicle.
结论：大多数的病例，椎弓根上半部的椎体外形为半球形，下半部为三角形。
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