First Post Test 发表于 2017-05-30 This is a testing. I hope it will work. 今夕复何夕，共此灯烛光 \[E=mc^2\] \[\hat{H} \lvert\psi\rangle = i\hbar\frac{\partial}{\partial t}\lvert\psi\rangle\] \[\sum_i a_i = \infty \] \[g_{\mu\nu} = g_{\nu\mu}\] \[D*\]