Share counter between amsthm and algorithm

Question

I am using amsthm

\usepackage{amsthm}
\newtheorem{thm}{Theorem}[chapter]
\newtheorem{lem}[thm]{Lemma}
\newtheorem{prop}[thm]{Proposition}

and algorithm

\usepackage{algorithm, algpseudocode}
\makeatletter
\renewcommand\thealgorithm{\thechapter.\arabic{algorithm}}
%\@addtoreset{algorithm}{chapter}
\makeatother

In my text I have everything numbered consecutively in each chapter (Definition 3.1, Lemma 3.2, Theorem 3.3) except for the algorithms which have separate counter (Definition 3.1, Lemma 3.2, Algorithm 3.1, Theorem 3.3). How can I make it so that algorithms are numbered together with everything else? (Definition 3.1, Lemma 3.2, Algorithm 3.3, Theorem 3.4)

use [algorithm] in all your \newthorem so they use that instead of thm — David Carlisle, May 11 '15 at 18:57
It's weird I was unable to google that. Please post it as an answer. — ondrejsl, May 11 '15 at 19:01
There are many posts using the share counter term. Consider looking at those... — Werner, May 11 '15 at 19:38

score 5 · Accepted Answer · answered May 11 '15 at 19:16

Use [algorithm] in all your \newthorem so they use the algorithm counter instead of thm.

Beware though, if you use a floating environment and a non-floating environment with the same counter the algorithm may float past the theorem so come in the wrong order.

score 1 · Answer 2 · answered Jun 28 '15 at 16:45

In the end I needed a different solution since I didn't have access to \newtheorem definitions.

\newcounter{common} % Create counter "common"

\makeatletter
\let\c@theorem\relax % drop existing counter "theorem" (you might not need this)
\makeatother

\usepackage{aliascnt}
\newaliascnt{theorem}{common} % let "theorem" be an alias for "common"
\newaliascnt{algorithm}{common} % let "algorithm" be an alias for "common"

Share counter between amsthm and algorithm

2 Answers2

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