答案1
您可以使用\newtagform
和\usetagform
from mathtools
。以下是一些示例:
\documentclass[leqno]{article}
\usepackage[utf8]{inputenc}
\usepackage{fourier, erewhon}
\usepackage{mathtools}
\newtagform{Alph}[\renewcommand{\theequation}{\Alph{equation}}]()
\newtagform{roman}[\renewcommand{\theequation}{\roman{equation}}]()
\newtagform{scroman}[\renewcommand{\theequation}{\scshape\roman{equation}}][]
\begin{document}
\usetagform{Alph}
\begin{equation}
a = b + c
\end{equation}
\usetagform{roman}
\begin{equation}
d = e + f
\end{equation}
\usetagform{default}
\begin{equation}
x = y + z
\end{equation}
\usetagform{scroman}
\begin{equation}
u = v + w
\end{equation}
\end{document}