I need a different numbering style for equations in the Supplementary Material, for example use
(S.1)
instead of
(1.1)
It works manually with \tag{S.1}
but is there a way to change the style for the whole document to (1) keep numbering automatic, (2) be able to use automatic cross referencing between main text and supplementary text?
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}
\begin{document}
\begin{equation}\tag{S.1}
\bar\gamma_M:=\frac{1}{\alpha+\alpha'}, \quad \bar\gamma_Z:=\frac{1}{\gamma+\gamma'}.
\end{equation}
\end{document}