OK, now, so there's an interesting thing to note, which is that we can use the usual product rule for derivatives with vector expressions, with dot products or cross products.

还有个很有趣的现象要注意一下，就是我们可以用乘积法则,对向量表达式求导，无论是点乘或叉乘。

youdao

Let me show you a picture. The rule is if I walk along C with S to my left then the normal vector is pointing up for me.

给你们看张图片，“相容”就是,如果我沿着C走，而且S在左边，法向量就是朝上的。

youdao

Tuple Folded Vector algorithm (TFV), introduced in this paper, is applied to multiple fields in big rule database.

基于元组空间提出了一种适用于多维大规则库的包分类算法——元组向量折叠算法。

youdao