Elsarticle: problems with appendix

Question

I use (elsarticle.cls) for writing a journal paper for Elsevier journal. I used the code:

\appendix
\section{Proposition \ref{p:1}}
\label{sec:app}

but I obtained the result:

This is not the desired result because I would like to obtain something like Proposition A.1 or Proposition 1, but not Proposition Appendix A.1.

Answer 1

Try

\documentclass[12pt]{elsarticle}
    \usepackage[a4paper]{geometry}
    \usepackage{lipsum}
\begin{document}
\lipsum[1]
\appendix
\renewcommand{\thesection}{\Alph{section}}
\section{Proposition}
\lipsum[2]
\end{document}