Introduction

$$\begin{aligned} \verb!\abs{x}!\text{: }\abs{x}\\ \verb!\abs*{x}!\text{: }\abs*{x} \end{aligned}$$

$$\newcommand{\f}[2]{#1f(#2)} \newcommand{\d}{\mathrm{d}} \f\relax{x}= \int_{-\infty}^\infty\f\hat\xi\,e^{2\pi i\xi x}\,\d\xi$$

$$f(x)=\int_{-\infty}^\infty\hat{f}(\xi)e^{2\pi i\xi x}\mathrm{d}\xi$$

Inline $\ce{CO2 + C -> 2 CO}$ test

• \long commands can include paragraph breaks like \par.