$…$,行间 $$…$$ 或 \[…\]。\alpha \beta,上下标 ^ _,分式 \frac{}{},根号 \sqrt{}。\section、\begin{itemize}、\begin{tabular}、\begin{equation}。# $ % & _ { } ~ ^ \ 需转义。LaTeX Symbol & Command Cheat Sheet - Search common LaTeX math symbols and commands, see the notation and click to copy. Free, browser-only.