Uncover lines of an align environment with beamer

Question

Is there any way to uncover equation-lines of an align* environment line per line in a frame conveniently?

somethink like

\begin{align*}[<+->]
    a &= b \\
    b &= c \\
    \Rightarrow \quad 
    a &= c \\
\end{align*}

or at least only one annotation per line.

Answer 1

Since you have an untagged environment, you can use

\documentclass{beamer}

\begin{document}

\begin{frame}
\begin{align*}
    \onslide<1->{a &= b \\}
    \onslide<2->{b &= c \\}
    \onslide<3>{\Rightarrow \quad 
    a &= c}
\end{align*}
\end{frame}

\end{document}

For a tagged environment additional work has to be done, as described in Section 23.4 Uncovering Tagged Formulas Piecewise of the beamer manual:

\documentclass{beamer}

\begin{document}

\begin{frame}
\begin{align}
    \onslide<1->{a &= b \\}
    \onslide<2->{b &= c \\}
    \onslide<3>{\Rightarrow \quad 
    a &= c \\}
\notag
\end{align}
\vskip-1.5em
\end{frame}

\end{document}