Hi I presume this is more a reftex than an auctex problem.
I did not pay much attention to the fact that in a beamer document I can
refer to a specific slide using (I attach a complete document just in case)
\begin{frame}[label={sec:orge783ce1}]{First section}
Some text
\begin{equation}
\label{eq:test-matlab-pretifier-beamer1}
\int
\end{equation}
\begin{enumerate}
\item list
\item new
\end{enumerate}
\end{frame}
The point is that if I use the command reftex-reference, this particular
label is not offered. So I think it would be good to add that
functionality to reftex, I think
Regards
Uwe Brauer
% Created 2021-01-04 lun 10:01
% Intended LaTeX compiler: pdflatex
\documentclass[presentation,colorlinks]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{longtable}
\usepackage[normalem]{ulem}
\usepackage{amsmath}
\usepackage{textcomp}
\usepackage{amssymb}
\usepackage{capt-of}
\usetheme{default}
\author{Uwe Brauer\thanks{[email protected]}}
\date{\today}
\title{}
\hypersetup{
pdfauthor={Uwe Brauer},
pdftitle={},
pdfkeywords={},
pdfsubject={},
pdfcreator={Emacs 28.0.50 (Org mode 9.3.7)},
pdflang={English}}
\begin{document}
\begin{frame}[label={sec:orge783ce1}]{First section}
Some text
\begin{equation}
\label{eq:test-matlab-pretifier-beamer1}
\int
\end{equation}
\begin{enumerate}
\item list
\item new
\end{enumerate}
\end{frame}
\begin{frame}[label={sec:org779cfb8}]{Second section}
Some text as in equation \eqref{eq:test-matlab-pretifier-beamer1}
Or in frame \ref{sec:orge783ce1}
\begin{enumerate}
\item list
\item new
\end{enumerate}
\end{frame}
\end{document}
%%% Local Variables:
%%% mode: latex
%%% eval: (my-set-castellano)
%%% TeX-master: t
%%% TeX-output-dir: "./build"
%%% End:
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