一些插件的测试

*line

Simple in line $a = b + c$.

*Block:

$$frac{partial u}{partial t}
= h^2 left( frac{partial^2 u}{partial x^2} +
frac{partial^2 u}{partial y^2} +
frac{partial^2 u}{partial z^2}right)$$

Multiple line content will be parsed as block math (same as $$.$$)

$$begin{aligned}
dot{x} & = sigma(y-x) \
dot{y} & = rho x - y - xz \
dot{z} & = -beta z + xy
end{aligned}$$

麦克斯韦方程组:
$$
begin{eqnarray}
nablacdotvec{E} &=& frac{rho}{epsilon_0} \
nablacdotvec{B} &=& 0 \
nablatimesvec{E} &=& -frac{partial B}{partial t} \
nablatimesvec{B} &=& mu_0left(vec{J}+epsilon_0frac{partial E}{partial t} right)
end{eqnarray}
$$