Changing the font for alert in beamer for math mode

Question

I would like to change the font of the alerted text in my beamer, I want it to be in bold, in both text and math mode. I tried using boldmath but it doesn't work :

\begin{frame}{Test}

\setbeamercovered{invisible}
\setbeamercolor{alerted text}{fg=vertf}

\setbeamerfont{alerted text}{family=\sffamily, series=\bfseries\boldmath}

$$\alert<2>{x} + \alert<3>{y} + \alert<4>{z}$$

\begin{itemize}
    \item <2-| alert@2>x 
    \item <3-| alert@3>y 
    \item <4-| alert@4>z
\end{itemize}

\end{frame}

Answer 1

You could work around the problem with something like this:

\documentclass{beamer}

\setbeamercovered{invisible}
\setbeamercolor{alerted text}{fg=green}


\setbeamerfont{alerted text}{series=\bfseries\boldmath}

\renewcommand<>{\alert}[1]{%
  \ifmmode\text{%
    \begin{alertenv}#2\relax$#1$\end{alertenv}%
  }%
  \else%
    \begin{alertenv}#2\relax#1\end{alertenv}%
  \fi%
}


\begin{document}
    
\begin{frame}
\frametitle{Test}


\[
\alert<2>{x} + \alert<3>{y} + \alert<4>{z}
\]

\begin{itemize}
    \item <2-| alert@2>x 
    \item <3-| alert@3>y 
    \item <4-| alert@4>z
\end{itemize}

\end{frame}

\end{document}