命令记录

# 代码块

#include <iostream>
using namespace std;
int main() { return 0; }

Mathjax

\begin{eqnarray} \nabla\cdot\vec{E} &=& \frac{\rho}{\epsilon_0} \\ \nabla\cdot\vec{B} &=& 0 \\ \nabla\times\vec{E} &=& -\frac{\partial B}{\partial t} \\ \nabla\times\vec{B} &=& \mu_0\left(\vec{J}+\epsilon_0\frac{\partial E}{\partial t} \right) \end{eqnarray}