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In a regular article using amsmath or amsart I can move the equation tag to the left for a single equation by using \tagsleft@true immediately before the equation. This doesn't seem to work in beamer. How can I move a single equation tag to the left side in beamer?

In particular when I try to run

\begin{frame}[t]
{\makeatletter
        \tagsleft@true
        \begin{equation}\tag{$\mathscr{P}_{i}$}
          x = y
        \end{equation}
\makeatother }
\end{frame}

I get Undefined control sequence \end{frame} and I don't get that error if I remove \tagsleft@true.

(Similar tips about replacing \setlength@mathmargin{1.5cm} and @fleqntrue in beamer would be appreciated too and I suspect these are all not working for the same reason).

Peter Gerdes
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    Related https://tex.stackexchange.com/questions/212085/tag-placing-with-amsmath/212099#212099 – Salim Bou Nov 05 '20 at 20:07
  • Wild guess, not tested. You might try moving the switch of side outside of the frame. Of course, then you'd have to reset it after the frame. – barbara beeton Nov 06 '20 at 02:40
  • @barbarabeeton thanks but the motivation is because I want to create a version of a special equation environment that works in beamer. This equation environment moves the tag to the left but it may be mixed with other equations so that's not really a solution I can use here. – Peter Gerdes Nov 07 '20 at 11:46
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    @PeterGerdes You can avoid the issues with using \makeatletter ... \makeatother inside the frame environment by using the custom \leqnomode macro from the duplicate question – samcarter_is_at_topanswers.xyz Jul 11 '22 at 16:52

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