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Quite a while (... years) ago I've come across some undesirable behaviour of the beamer package when starting to use \pause inside align[*] environments. I wouldn't have seen it if a

Package nag Warning: Environment eqnarray is obsolete.

had not motivated me to replace eqnarray* with align*. Here my MWE:

    \documentclass{beamer}
    \begin{document}
    \frame{Undesirable:
      \begin{align*}
        A &= B + C \\\pause
        B &= D + E \\\pause
        C &= F + G
      \end{align*}}
    \frame{Expected:
      \begin{eqnarray*}
        A &= B + C \\\pause
        B &= D + E \\\pause
        C &= F + G
      \end{eqnarray*}}
    \end{document}

With eqnarray*, \pause works perfectly, although this and that post refer to the beamer manual suggesting there to be no acceptable solution using \pause inside array-like environments. (BTW: Found it helpful to know that \pause can be used in listings.)

So, thank you for any hints on some non-amsmath but nag-compliant alternative.

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    I'm not sure why you call a documented behaviour "unexpected", but you can find a workaround at topanswers.xyz/tex?q=1126 Commented Dec 3, 2023 at 23:27
  • Thanks a lot for this hint. Well, I should have written "undesired" but it has definitely been "unexpected" to me for years until I found some time to search for hints and came across the documentation. So, mea culpa, hope my question is a still valid.
    – mfg
    Commented Dec 3, 2023 at 23:41

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