Document Classes ⇒ the packages empheq and ntheorem

[warrence]

hi community!

i'm currently trying to get empheq and ntheorem to work together, but somehow i cannot achieve it.
translating the following document

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\documentclass{book}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[ngerman, english]{babel}
\usepackage{array, paralist}
\usepackage[pdftex]{geometry}
\usepackage{amsmath, amssymb}
\usepackage{multicol, multirow}
\usepackage{ulem}
\usepackage{makeidx}
\usepackage[ngerman, english]{varioref}
\usepackage{bbm, stmaryrd}
\usepackage{calc}
\usepackage{ifthen}
\usepackage{wrapfig, picins}
\usepackage{marginnote}
\usepackage{color}
\usepackage{framed}
\usepackage{empheq}
\usepackage[bookmarksopen, colorlinks=false, pdfpagemode=UseNone, pdfstartview=Fit]{hyperref}
\usepackage[framed, hyperref, thmmarks, amsmath, thref]{ntheorem}

\begin{document}

\begin{empheq}[left=\empheqlbrace,right=\empheqrbrace]{align}
E&=mc^2\\
Y&=\sum_{n=1}^\infty\frac{1}{n^2}
\end{empheq}

\end{document}

raises the following error:

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! Undefined control sequence.
\TagsPlusEndmarks ...e \iftag@ \SetTagPlusEndMark 
                                                  \else \SetOnlyEndMark \fi ...
l.29 \end{empheq}

If i remove

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\usepackage[framed, hyperref, thmmarks, amsmath, thref]{ntheorem}

it works.

any ideas about how to fix this would be appreciated! thanks in advance,

Stefan

[balf]

Perhaps it is a matter of the order for loading the packages. Try loading empheq after ntheorem.

B.A.

[warrence]

sorry, i did not mention that i already tried this...

[balf]

Maybe there is a conlict with one of the options of ntheorem. Also, the doc of empheq says there maybe problems with hyperref, as both redefine LaTeX mechanism for labels, although empheq tries hard to be compatible, the author says . You could try to ask for help from him after you've circumscribed the problem. He's very responsive.

B.A.

[warrence]

i found out how to fix it, kind of sick...
i already tried to call ntheorem with

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\usepackage[framed, hyperref, thmmarks, amsmath, thref, empheq]{ntheorem}

causing latex to tell me that "empheq" is an unknown option, but to produce a different error...
what actually is working and what i did not try is to call empheq by

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\usepackage[ntheorem]{empheq}

this is a known bug of ntheorem, by the way.
thanks anyway, i would not have looked up the list of contributors of empheq by myself, where this is written...

Stefan

Edit: now the test case works, but my "working document" still produces errors, to be exact:

! Missing \endcsname inserted.
<to be read again>
\csname\endcsname
l.580 \end{empheq}

this problem seems to be caused by the document option "fleqn" used in the main document. using

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\documentclass[11pt, twoside]{scrartcl}

instead of

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\documentclass[11pt, twoside, fleqn]{scrartcl}

works. now the question is how to use both, fleqn and empheq...
loading empheq with

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\usepackage[ntheorem, fleqn]{empheq}

does not work as well...

thanks in advance,
Stefan