# Consecutive number of theorems, propositions, etc

I'm using

\usepackage{amsthm}
\newtheorem{theorem}{Theorem}
\newtheorem{proposition}{Proposition}


The numberings of Theorem and Proposition are not consecutive (I get Theorem 1 followed by Proposition 1 instead of Theorem 1 followed by Proposition 2). How can I fix it?

I need this numbering because otherwise I would have Theorem 1, Proposition 1, Lemma 1, Corollary 1, Remark 1, etc. which I think is very confusing if I reference Proposition 1 later.

• Why you need that numbering? LaTeX and its packages are usually made ​​for standard document composition. – OSjerick Nov 12 '13 at 1:58
• @osjerick Please see my edit. – Kunal Nov 12 '13 at 2:00
• several variations on the numbering of theorem-class objects, including this one, are covered in the user's guide: texdoc amsthm. – barbara beeton Nov 12 '13 at 15:00

The \newtheorem construction offers two optional arguments. The first one fixes your numbering. In this case it means that proposition should use the same counter as theorem.

\documentclass{article}

\usepackage{amsthm}
\begin{document}

\newtheorem{theorem}{Theorem}
\newtheorem{proposition}[theorem]{Proposition}

\begin{theorem}
1+1=2.
\end{theorem}

\begin{proposition}
1+2=3
\end{proposition}

\end{document}


• Oh I see, thanks. So if I want remark to use the same numbering as theorem, proposition, and corollary, do I put \newtheorem{theorem,proposition,corollary}[remark]{Remark}? – Kunal Nov 12 '13 at 2:06
• @Kunal Rather one by one. If the main is theorem, then \newtheorem{remark}[theorem]{Remark} and so on. – Przemysław Scherwentke Nov 12 '13 at 2:08