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in my paper the text inside theorem is italic while the word Theorem 1 is bold and not italic. I would like to have a title of the theorem also not italic. The example is here:

Theorem 1. (The title) Let the set...

How can I do it? I tried to type \begin{theorem}{title here} but it doesn't work.

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up vote 13 down vote accepted


\begin{theorem}[The title]
Some statement

should do what you want. The standard LaTeX setting prints in boldface also the title, which doesn't happen when amsthm is loaded.

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Thanks, it works. – Ilya Jul 3 '11 at 19:39
@Gortaur: with default settings also the title would be bold. – Stefan Kottwitz Jul 3 '11 at 19:46
@Stefan Not with amsthm, which I prefer. – egreg Jul 3 '11 at 19:58
@egreg: I prefer it too. It just hasn't been mentioned in the question, so I tested without. – Stefan Kottwitz Jul 3 '11 at 20:12

You might like to test \newtheorem{theorem}{\textit{Theorem}} before \begin{document} then \begin{theorem} Some statement \end{theorem}

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But where the title? – Ilya Sep 25 '11 at 21:02
In pre-definition of \newtheorem{theorem}{bloh,bloh} whatever you put as {bloh,bloh} comes in place of your title "Theorem 1" you mentioned as bold face (except the counter). You do not need to use \begin{theorem}[The Title]. Just \begin{theorem} is enough, then. [You can format counter of theorems by, say, \numberwithin{theorem}{section}]. – Peter Jones Sep 26 '11 at 7:04
Ok, I've got your point, thanks. – Ilya Sep 26 '11 at 7:55
You also might like to test this "\newtheorem{theorem}{\large T\small\textit{heorem}}" – Peter Jones Sep 27 '11 at 10:08

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