\documentclass{article} \usepackage{amsmath} \usepackage{caption} \usepackage{amsthm} \newtheorem{lemma}{Lemma} \begin{document} \section{Foo}% \label{sec:foo} \begin{equation}% \label{eq:foo} 1 + 1 = 2 \end{equation} \begin{equation}% \label{eq:bar} 1 + 1 = 2 \end{equation} \begin{figure}% \LaTeX{} \caption{Baz}% \label{fig:baz} \end{figure} \begin{lemma}% \label{thm:foo} 1 + 1 = 2 \end{lemma} \include{bar} \end{document}