mathtest

this is A test

test mathjax

$$f([\frac{1+\{x,y\}}{(\frac{x}{y}+\frac{y}{x})(u+1)}+a]^{3\2})$$ $$\begin{eqnarray} \nabla\cdot\vec{E} &=& \frac{\rho}{\epsilon_0} \\ \nabla\cdot\vec{B} &=& 0 \\ \nabla\times\vec{E} &=& -\frac{\partial B}{\partial t} \\ \nabla\times\vec{B} &=& \mu_0\left(\vec{J}+\epsilon_0\frac{\partial E}{\partial t} \right) \end{eqnarray}$$