hello-world

This is test for my first instance

革命无罪 造反有理

愿做星火，直到黎明。

$$\frac{\partial t}{\partial \tau} = a\nabla t +\frac{q_v}{\rho c_p}$$

$$\mathcal{Z}[f(t)] = \sum_{k=0}^\infty f(kT)z^{-k}$$