I have the following working example.
\RequirePackage{amsmath}
\documentclass{llncs}
\begin{document}
\begin{theorem}
\label{thm:ex}
A very important result.
\end{theorem}
Some comments here \ldots
\begin{proof}[Proof of Theorem \ref{thm:ex}]
It follows by inspection.
\end{proof}
\end{document}
This produces "Proof (Proof of Theorem 1)." as opposed to just "Proof of Theorem 1." – I was trying to mimic the solution here How can I create a "Proof of Theorem x.xx" header for a proof environment?, which does not appear to work with the LLNCS class. What's the simplest way to do this? I am trying to avoid using many additional packages, as instructed by the conference.
Edit: In my paper, I also have things like "Theorem 1 (Bob [2]).", which I would like to keep as is… so I need to make sure that the solution proposed does not effect such things.
Best Answer
When there is an optional argument, the header (label) of unnumbered theorem-style environments is defined by the
\@Opargbegintheorem
macro.Add:
in the preamble of the document.