\documentclass{report} \usepackage{amssymb, amsmath, hyperref} \usepackage{tikz} \usepackage{tikz-cd} \theoremstyle{plain} \newtheorem{theorem}[subsection]{Theorem} \newtheorem{proposition}[subsection]{Proposition} \newtheorem{lemma}[subsection]{Lemma} \theoremstyle{definition} \newtheorem{definition}[subsection]{Definition} \newtheorem{example}[subsection]{Example} \newtheorem{exercise}[subsection]{Exercise} \newtheorem{situation}[subsection]{Situation} \theoremstyle{remark} \newtheorem{remark}[subsection]{Remark} \newtheorem{remarks}[subsection]{Remarks} \numberwithin{equation}{subsection} \begin{document} \chapter{A first chapter} \label{chapter:first} \section{A first section} \label{section:first} \begin{lemma} \label{lemma:pythagoras} $a^2=b^2+c^2$ \end{lemma} \begin{tikzpicture} \draw (0,0) --(1,2); \end{tikzpicture} \begin{tikzcd} a \arrow[r] & b \end{tikzcd} \section{A second section} \label{section:second} \chapter{A second chapter} \label{chapter:second} \section{A third section} \label{section:third} \section{A fourth section} \label{section:fourth} \end{document}