This question is related to How to change the word "Proof" in the proof environment?. I would like that the proofs in my document begin with "Proof. ---", instead of the standard "Proof." by default. But if I try to modify this setting, whatever solution I tried, I also get an extra line break at the end of the proof (and the \qed is placed on the extra blank line).
Here is a MWE:
\documentclass[a4paper,11pt]{article}
\usepackage[french]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsthm}
\usepackage{enumitem}
\newtheorem{theo}{Theorem}[section]
\renewenvironment{proof}{{\noindent \itshape Proof. ---}}{\qed}
\begin{document}
\begin{theo}
My theorem.
\end{theo}
\begin{proof} In two steps:
\begin{enumerate}[label=(\roman*)]
\item The first step
\item The second step
\qedhere
\end{enumerate}
\end{proof}
\end{document}
As you can see in this MWE, the "Proof. ---" is correctly set, but I get an extra new line. I tried some solutions (found on SE) to remove the extra new line, but it seems that none of them is compatible with the "renaming" of proof environment. How can I do both?
Thanks!
amsthm.sty
to your preamble and modify that. This very naïvely approach in the MWE is asking for trouble.