Definition counter resetting on new section

Question

I encountered this behavior from LaTex: last definition from section 2.1 was labeled (correctly) as 2.1.8. Then, the first definition of the next section was 2.2.9. I would like it to be 2.2.1 (don't know the standards but that makes much more sense to me). I found this question which is kinda relevant but works with theorems and not definitions.

The only commands(I think) that modify somehow the definitions are:

\newtheorem{definition}{MyDef}

\renewcommand{\thedefinition}{\arabic{chapter}.\arabic{section}.\arabic{definition}}

So, how do I change it? Thanks in advance.

A simple \newtheorem{definition}{Definition}[section] should work as expected and number youd definitions as follows: "chapter.section.definition" while the definition counter starts from 1 with every new section. — leandriis, Oct 17 '20 at 11:51

score 2 · Accepted Answer · answered Oct 17 '20 at 11:52

Using \newtheorem{definition}{Definition}[section] should result in the expected output:

\documentclass{report}
\newtheorem{definition}{Definition}[section]
\begin{document}
\chapter{chapter}
\section{first section}
\begin{definition}
first definition in first section
\end{definition}
\begin{definition}
second definition in first section
\end{definition}
\section{second section}
\begin{definition}
first definition in second section
\end{definition}
\end{document}

Thank you very much. Simple and effective. – cgss Oct 17 '20 at 11:54 — cgss, Oct 17 '20 at 11:54

Definition counter resetting on new section

1 Answers1