补充： Cross Product as a Matrix Product

We can convert the cross product \(\mathbf{r}\times\) into a matrix product \(\mathbf{r}^*\).

✅ \(\mathbf{r}^*\) 是 \(\mathbf{r}\) 的 cross matrix.
目的：用矩阵形式代替叉乘形式，方便公式化简

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https://caterpillarstudygroup.github.io/GAMES103_mdbook/