mturner.org

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

\begin{align*}\\ e^x & = 1 + x + \frac{x^2}{2} + \frac{x^3}{6} + \cdots \\\\ & = \sum_{n\geq 0} \frac{x^n}{n!}\\ \end{align*}