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Quite simple. Thank you!

Edit: Ok. Figured out what went wrong in my approaches: My first one would have worked had I used \def and \let:
\let\oldendtheorem\endtheorem
\def\endtheorem{MyStuff. \oldendtheorem}
My second one needs \makeatletter:
\makeatletter
\def\@endtheorem{\hfill\rule{3ex}{0 ...

Hi,

I'm using amsthm for typesetting theorems. Now I want to put a horizontal rule below "theorem"-Environments. I know how to place rules, what I don't know is how to tell amsthm to write something below each theorem-Environment. The \newtheoremstyle command isn't of any help here, since it does ...