Hi,
Thanks for your reply. This does not fix it. Comparing the LaTeX source for
a document exported using LyX 1.5 and LyX 1.6 it seems that in LyX 1.6 there
is missing the following line:
\newtheorem{thm}{Theorem}[section]
Below I attach the LaTeX code for a simple file containing one theorem.
The first one is exported by LyX 1.5
%% LyX 1.5.3 created this file. For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[oneside]{amsart}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Textclass specific LaTeX commands.
\numberwithin{equation}{section} %% Comment out for sequentially-numbered
\numberwithin{figure}{section} %% Comment out for sequentially-numbered
\theoremstyle{plain}
\newtheorem{thm}{Theorem}[section]
\makeatother
\begin{document}
\begin{thm}
Test
\end{thm}
\end{document}
The next one is exported by LyX 1.6:
%% LyX 1.6.0svn created this file. For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[oneside,english]{amsart}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage{amsthm}
\usepackage{babel}
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Textclass specific LaTeX commands.
\theoremstyle{plain}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
%\usepackage{amsthm}
\makeatother
\begin{document}
\begin{thm}
Test
\end{thm}
\end{document}
Thank you,
Marius
On Tue, Mar 11, 2008 at 12:06 PM, rgheck <[EMAIL PROTECTED]> wrote:
> Marius Ionescu wrote:
> > Hello,
> >
> > I installed LyX 1.6 from svn yesterday (I am trying to update the
> Romanian
> > localization). Whenever I open one of the documents I wrote using LyX
> > 1.5and try to vizualize them I receive the following error:
> > "LaTeX Error: Environment thm undefined"
> >
> > I receive the same error if I start a new document, select the AMS
> class,
> > add the "Theorems (AMS)" module, write a theorem or proposition, and try
> to
> > view the document. I do not get this error message if I select the
> "Theorem"
> > module instead. I do need, however, to use the "Theorems (AMS)" module
> for
> > my work.
> >
> >
> I'll look at this shortly. In the meantime, try adding
> "\usepackage{amsthm}" to the preamble.
>
> rh
>
>
