llncs: Upright text in theorems and lemmas

Question

By default the llncs class defines a host of theorem-like environments, without my loading amsthm. Some of them, such as Theorem, Lemma, Corollary, set their text in italics.
I think this is not very good, typographically, and I would like to change it. Besides manually writing normalfont after each begin{theorem}, what can I do?
In a similar vein, I would also like to put a qed before the end of each end{proof}. Maybe there is a similar solution?

gernot · Accepted Answer

Preface (personal opinion): llncs.cls is not particularly pretty, so I would only use it if I had to (because of submitting to a Springer venue). In this case, I would not change the predefined settings, because this is the way the elements (like theorems) are supposed to look like. It's up to the editor to define a common appearance.
Regarding your questions: You can define your own environments, like
spnewtheorem{thm}{Theorem}{bfseries}{}

If you want/have to reuse the theorem environment, you can redefine it:
lettheoremrelax
spnewtheorem{theorem}{Theorem}{bfseries}{}

To obtain a square at the end of proofs, llncs.cls defines  the command qed.

documentclass{llncs}
lettheoremrelax
spnewtheorem{theorem}{Theorem}{bfseries}{}
begin{document}
begin{theorem}
  The theorem I worked on all my life.
end{theorem}
begin{proof}
  The result is obvious.qed
end{proof}
end{document}

llncs: Upright text in theorems and lemmas

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