Document Classes ⇒ Theorems counters with beamer

[eoa]

Hi. I hope this is not an unnecessary post (again), in that, though I did search for related topics, I hope I didn't commit another silly error. Anyhow, here's my MWE:

Code: Select all

\documentclass{beamer}

\usepackage{beamerthemesplit}

\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}

\newtheorem{lem}{Lemma}[section]
\newtheorem{thm}[lem]{Theorem}
\newtheorem{exm}[lem]{Example}

\begin{document}

\frame
{
	\begin{itemize}
	\item<1->	\begin{lem}
						Let $A = (a_{ij}) \in M_{n}$ and suppose $A \geq O.$ If the row sums of $A$ are all greater than zero (that is, $\sum\limits_{j = 1}^{n} a_{ij} > 0$ for all $i = 1,2,\ldots,n$), then $\rho(A) > 0,$ and in particular, we have that $\rho(A) > 0$ if $A > O$ or $A$ is non-negative and irreducible.
						\end{lem}
	
	\end{itemize}
}

\end{document}

My question is: why aren't the Lemma numbers appearing? I think it might be because I have [section] in

Code: Select all

\newtheorem{lem}{Lemma}[section]

, but don't actually define a new section. However, I changed that, and still no luck. Also, I don't want it numbered according to sections, I want it numbered from 1, 2, 3.... Actually, I thought this was default.

[Stefan Kottwitz]

Hi,

use

Code: Select all

\setbeamertemplate{theorems}[numbered]

Stefan

[eoa]

Thanks for that Stefan_K. And for the speedy reply.