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Possible Duplicate:
problem compiling some 'math' using LuaLaTeX

While trying to write an equation it seems that the square root does not like particular elements. I tried to pinpoint the problem but I am a little stuck. After some time I could get a MWE together to reproduce the problem. 

\documentclass[12pt]{article}

\usepackage{lmodern}

\usepackage[intlimits]{amsmath}

\begin{document}

\begin{align}
 \tau_{1,2} = \sqrt{ \frac{(k)^2}{4 k_a^2} } \\
 \tau_{1,2} = \sqrt{ \frac{(k)^2}{4 k_a} } 
\end{align}

\end{document}

The output with lualatex looks as follows: enter image description here

There are no error messages in the output. The problem disappears when I either disable \usepackage{lmodern} or switch to pdftex instead of lualatex. Is this a known bug, am I doing something wrong or is there a workaround?

David Carlisle
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Alexander
  • 9,163
  • It's a bug. See http://tex.stackexchange.com/questions/61952/problem-compiling-some-math-using-lualatex/61961#comment131578_61952 – egreg Jul 23 '12 at 20:52
  • @egreg: Thank you for the quick reply. This is frustrating but at least it will get fixed at some point in the future. – Alexander Jul 23 '12 at 21:03

0 Answers0