I'm trying to get QED markers to show up at the end of a proof only, using ntheorem
but run into a couple of problems.
First, using the amsthm
option with ntheorem
doesn't work:
\documentclass[a4paper, twosided]{article}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage[standard, amsthm, amsmath]{ntheorem}
\begin{document}
\begin{Theorem}
A really insightful theorem.
\end{Theorem}
\begin{proof}~\\
$\forall g \in G \ldots$
\end{proof}
\end{document}
gives the following errors:
! Package ntheorem Error: Theorem style plain already defined.
! Latex Error: Command \proof already defined.Or name \end... illegal
When I remove the \usepackage{amsthm}
and amsthm
from the ntheorem
options it will build fine, but still no QED markers at the end of the proof.
Using the thmmarks
option with ntheorem
puts QED symbols at the ends of theorems as well, which I don't want.
ntheorem
documentation does say thatamsthm
andntheorem
can be used together, but if theamsthm
option is chosen, thestandard
option cannot be used. that is the source of the duplicateproof
definition. (`ntheorem' documentation, p.16, section 3.2.2.) – barbara beeton Feb 6 '17 at 22:08