derived relational algebra operators 关系代数的派生算子
The derived relational algebra operators are widely used in the relational database query languages.
关系代数的派生算子在关系数据库查询语言中得到了广泛应用。
The coordinate transformation matrix based on the direction cosine parameters from the object coordinate system to the world coordinate system is derived by vector algebra.
利用矢量代数的方法，推导出以方向余弦为参量的物坐标系到世界坐标系的坐标变换矩阵；利用矩阵求逆的方法，推导出世界坐标系到物坐标系的坐标变换矩阵。
My friend and I did some arithmetic, some algebra, derived the general formula for the differential at a point-all stuff he had had in the course.
我和我的朋友做了些算术和代数，得到了某一点的微分公式——这些都是他上课学过的。
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