lncsnumberingtheorems
Is there a way to control the numbering of different types of theorems, when using the llncs style?
With the envcountsame parameter, all theorems/definitions/claims use the same counter and get sequential numbering. What I'd like to have is that Theorems / Propositions / Lemmas will use one counter, and Definitions will use a different counter (also Remarks should use a new counter, maybe the one of Lemmas maybe totally fresh one).
Suggestions?
You need to make a "dummy" theorem and make all the others subordinate to that. For example:
\documentclass{article}
\usepackage{amsthm,amsmath}
% \newtheorem{dummy}{Dummy}[section]
\newcounter{dummy} \numberwithin{dummy}{section}
\newtheorem{thm}[dummy]{Theorem}
\newtheorem{defn}[dummy]{Definition}
\begin{document}
\section{First}
\begin{thm}
\end{thm}
\begin{defn}
\end{defn}
\section{Second}
\begin{thm}
\end{thm}
\begin{defn}
\end{defn}
\end{document}
Either the commented \newtheorem line or the \newcounter line works; the \numberwithin command is defined by amsmath, but if you are using amsthm you are probably using that too. If not, then the \newtheorem line works just with amsthm.
Similar to the solution at this question and section 3 of the amsthm documentation:
\documentclass[11pt,a4paper]{report}
\usepackage{amsthm}
\theoremstyle{plain}
\newtheorem{thm}{Theorem}[chapter] % reset theorem numbering for each chapter
\theoremstyle{definition}
\newtheorem{defn}[thm]{Definition} % definition numbers are dependent on theorem numbers
\newtheorem{exmp}[thm]{Example} % same for example numbers
\newcommand{\chaptercontent}{
\section{Basics}
\begin{defn}Here is a new definition.\end{defn}
\begin{thm}Here is a new theorem.\end{thm}
\begin{thm}Here is a new theorem.\end{thm}
\begin{exmp}Here is a good example.\end{exmp}
\subsection{Some tips}
\begin{defn}Here is a new definition.\end{defn}
\section{Advanced stuff}
\begin{defn}Here is a new definition.\end{defn}
\subsection{Warnings}
\begin{defn}Here is a new definition.\end{defn}
}
\begin{document}
\tableofcontents
\part{Addition and Subtraction}
\chapter{Addition} \chaptercontent
\chapter{Subtraction} \chaptercontent
\part{Multiplication and Division}
\chapter{Multiplication} \chaptercontent
\chapter{Division} \chaptercontent
\end{document}
Best Answer
You can define new theorem-like environments numbered as you like. If you want definitions to use their own counter, you can do
and this will do. You could also redefine the
definitionenvironment:This might be even better, so you can revert to the usual class setting just by commenting the two lines.