哈密顿算子和向量的叉乘则成为旋度: \begin{split} \nabla \times\vec{v} &=\left( \frac{\partial}{\partial x}\vec{i}+\frac{\partial}{\partial y}\vec{j}+\frac{\partial}{\partial z}\vec{k} \right) \times\left( u\vec{i}+v\vec{j}+w\vec{k} \right) \\ &=\begin{vmatrix} ...