Problem with beamer's \pause in alignments

Anonymous avatarAnonymous created an issue

The following code

\documentclass{beamer}
\mode<presentation> { \setbeamercovered{transparent} }

\begin{document}
\begin{frame}
\[
  \begin{cases}
  v(t,x) &= g(t,x), \\
  \pause
  u(x) &= f(x)
  \end{cases}
\]
\end{frame}
\end{document}

compiles nicely, but everything except "u(x)" already shows up on the first slide if I use beamer.cls v 1.70 2007/03/11 18:50:44. With v 1.55 2004/10/11 16:09:50 everything works as expected: On the first slide, the full second line is shown in transparent style. This seems similar to issue #87.

The same happens if I use plain TeX's \halign, so cases is not the culprit. Moreover, if I don't use \setbeamercovered{transparent}, then everything works as expected. In other words, \pause doesn't work together with \setbeamercovered{transparent} and \halign.

I've also posted the issue here: http://tex.stackexchange.com/q/6348/1235

Comments (2)

  1. Joseph Wright

    This is due to the way cases is implemented, and without major changes to both beamer and amsmath it's not going to change. It's therefore a 'known issue' (and is covered in the manual).

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