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documentclass[12pt]{article}

usepackage{amsmath}



begin{document}



As shown in Appendix~ref{app_eg},...



appendix

renewcommand{thesection}{Alph{section}}

numberwithin{equation}{section}



section{An example}

label{app_eg}



begin{equation}

1+1=2

label{pert}

end{equation}



end{document}

documentclass[12pt]{article}

usepackage{amsmath}



begin{document}



As shown in Appendix~ref{app_eg},...



appendix

renewcommand{thesection}{Alph{section}}

numberwithin{equation}{section}



section{An example}

label{app_eg}



begin{equation}

1+1=2

label{pert}

end{equation}



end{document}

documentclass[12pt]{article}

usepackage{amsmath}



begin{document}



As shown in Appendix~ref{app_eg},...



appendix

renewcommand{thesection}{Alph{section}}

numberwithin{equation}{section}



section{An example}

label{app_eg}



begin{equation}

1+1=2

label{pert}

end{equation}



end{document}

documentclass[12pt]{article}

usepackage{amsmath}



begin{document}



As shown in Appendix~ref{app_eg},...



appendix

renewcommand{thesection}{Alph{section}}

numberwithin{equation}{section}



section{An example}

label{app_eg}



begin{equation}

1+1=2

label{pert}

end{equation}



end{document}

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