麦克斯韦方程组

\begin{aligned} \nabla \cdot \vec{E} & = \frac{ρ}{ϵ_{0}} \\ \nabla \times \vec{E} & = - \frac{\partial \vec{B}}{\partial t} \\ \nabla \cdot \vec{B} & = 0 \\ \nabla \times \vec{B} & = μ_{0} \vec{j} + \frac{1}{c^{2}} \frac{\partial \vec{E}}{\partial t} \end{aligned}