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how to enumerate theorems using letters?

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There are some packages supporting theorems, for instance theorem, amsthm and ntheorem. It would be good if you mention which package do you use. Also the document class might be of importance regarding the counter presentation. –  Stefan Kottwitz Aug 16 '10 at 21:21
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1 Answer 1

You could redefine the presentation of the theorem counter. For example:

\documentclass{article}
\newtheorem{theorem}{Theorem}
\renewcommand*{\thetheorem}{\Alph{theorem}}
\begin{document}
\begin{theorem}
  Text
\end{theorem}
\end{document}

Output:

Alph numbering

If your counter has the name theorem, the corresponding output command has the name \thetheorem. The command \Alph takes a counter as argument and returns the value converted into the corresponding capital letter. \alph would return lowercase letters instead.

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