# How to change the numbering style of theorems based on the section number using amsthm?

I am using amsthm for theorems, propositions, and so on. But I altered the section numbering style so that it's '§1 First Section', hence my theorems are numbered (since I base them on sections) 'Proposition §1.1' or similar. How can I change this behaviour to just the numbers without '§', but also without having to change my sectioning style again?

\documentclass[a4paper,10pt]{scrreprt}
\usepackage{amsmath,amsthm}

\renewcommand{\thesection}{\S\arabic{section}}

\newtheorem{prop}{Proposition}[section]

\begin{document}
\chapter{Prerequisites}
\section{First Section}
\begin{prop}
Blub
\end{prop}
\end{document}


Thank you very much in advance!

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You could use

\renewcommand{\theprop}{\arabic{section}.\arabic{prop}}

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Hello @cmhughes, and thank you for your answer. I can't test it right now, but I'll do it first thing tomorrow. One question: Is \theprop something that will be defined by amsthm automatically once I define \newtheorem{prop}{Proposition}[section] (i.e., there are similar \the... commands for my other theorem environments as well)? –  InvisiblePanda Jul 13 '12 at 21:34
@Randal'Thor yep :) –  cmhughes Jul 13 '12 at 21:44

Use this:

\documentclass[a4paper,10pt]{scrreprt}
\usepackage{amsmath,amsthm}
\makeatletter
‎\renewcommand\@seccntformat[1]{\S‎
{\csname ‎the#1\endcsname}‎}
\makeatother ‎‎‎