我正在尝试使用以下答案对子群中的子方程环境中的方程进行编号（类似于示例）这，这， 和这问题，但我无法得到结果！
\documentclass{article}
\usepackage{amsmath}
\newcommand\StepSubequations{
\stepcounter{parentequation}
\stepcounter{equation}
\gdef\theparentequation{\arabic{parentequation}\Alph{equation}}
\setcounter{equation}{0}
\setcounter{parentequation}{1}
}
\begin{document}
\begin{subequations}
\begin{align}
1 &= 1\\
2 &= 2\\
\StepSubequations
3 &= 3\\% from here a new equation number
4 &= 4\\
5 &= 5\\
6 &= 6\\
\StepSubequations
7 &= 7\\
8 &= 8\\
\StepSubequations
9 &= 9\\
\end{align}
\end{subequations}
\end{document}
预期成绩：
（1aA）
（1aB）
（1bA）
（1bB）
（1bC）
（1bD）
（1cA）
（1CB）
(1天)
答案1
我不确定您到底想做什么，也不知道在subequations您不使用的环境中会发生什么\StepSubequations......也许创建一个新的环境（作为原始环境的副本）来按照您想要的方式处理事情是个好主意，这样您就可以保留原始行为。
无论如何，像这样的事情可以作为起点（但它不会抑制单个“A”，因为这需要向前看）：
\documentclass{article}
\usepackage{amsmath}
\usepackage{etoolbox}
\newcounter{equationgroup}
\makeatletter
\patchcmd\subequations
{\def\theequation{\theparentequation\alph{equation}}}
{\def\theequation{\theparentequation\Alph{equation}}\ifmeasuring@\else\setcounter{equationgroup}{1}\fi}
{}{}
\makeatother
\newcommand\StepSubequations{
\stepcounter{equationgroup}
\stepcounter{equation}
\gdef\theparentequation{\arabic{parentequation}\alph{equationgroup}}
\setcounter{equation}{0}
}
\begin{document}
\begin{subequations}
\begin{align}
1 &= 1\\
2 &= 2\\
\StepSubequations
3 &= 3\\% from here a new equation number
4 &= 4\\
5 &= 5\\
6 &= 6\\
\StepSubequations
7 &= 7\\
8 &= 8\\
\StepSubequations
9 &= 9
\end{align}
\end{subequations}
\begin{subequations}
\begin{align}
1 &= 1\\
2 &= 2\\
\StepSubequations
3 &= 3\\% from here a new equation number
4 &= 4\\
5 &= 5\\
6 &= 6\\
\StepSubequations
7 &= 7\\
8 &= 8\\
\StepSubequations
9 &= 9
\end{align}
\end{subequations}
\end{document}
您还可以将重新定义放入随后需要执行的命令中（这将使您能够subequations更轻松地在环境的原始行为和调整后的行为之间进行切换）。因此，可能是这样的：
\documentclass{article}
\usepackage{amsmath}
\newcounter{subequationsgroup}
\makeatletter
\AddToHook{env/subequations/after}{%
\stepcounter{parentequation}%
\gdef\theequation{\theparentequation}%
}
\newcommand{\InitializeSubequationsGroups}{%
\ifmeasuring@\else%
\setcounter{subequationsgroup}{\value{equation}}%
\fi%
}
\newcommand{\StepSubequationsGroup}{%
\ifmeasuring@\else%
\stepcounter{subequationsgroup}%
\setcounter{equation}{0}%
\gdef\theequation{\theparentequation\alph{subequationsgroup}\Alph{equation}}%
\fi%
}
\newcommand{\StepSubequationsSingle}{%
\ifmeasuring@\else%
\stepcounter{subequationsgroup}%
\setcounter{equation}{0}%
\gdef\theequation{\theparentequation\alph{subequationsgroup}}%
\fi%
}
\makeatother
\begin{document}
\begin{subequations}
\begin{align}
1 &= 1\\
2 &= 2
\end{align}
\end{subequations}
\begin{subequations}
\begin{align}
\InitializeSubequationsGroups
\StepSubequationsGroup
1 &= 1\\
2 &= 2\\
\StepSubequationsGroup
3 &= 3\\% from here a new equation number
4 &= 4\\
5 &= 5\\
\StepSubequationsSingle
6 &= 6\\
\StepSubequationsGroup
7 &= 7\\
8 &= 8\\
1 &= 1\\
2 &= 2
\end{align}
\end{subequations}
\begin{subequations}
\begin{align}
1 &= 1\\
2 &= 2
\end{align}
\end{subequations}
\end{document}
align我最后一次尝试，它应该允许您在环境中放置多个命令subequations。您只需要注意\EndSubequationsGroup如果命令位于subequations环境中的最后，则将其放置在何处：
\documentclass{article}
\usepackage{amsmath}
\newcounter{subequationsgroup}
\makeatletter
\AddToHook{env/subequations/before}{%
\gdef\theequation{\arabic{equation}}%
}
\newcommand{\BeginSubequationsGroup}{%
\ifmeasuring@\else%
\setcounter{subequationsgroup}{\value{equation}}%
\setcounter{equation}{0}%
\stepcounter{subequationsgroup}%
\gdef\theequation{\theparentequation\alph{subequationsgroup}\Alph{equation}}%
\fi%
}
\newcommand{\EndSubequationsGroup}{%
\ifmeasuring@\else%
\setcounter{equation}{\value{subequationsgroup}}%
\gdef\theequation{\theparentequation\alph{equation}}%
\fi%
}
\makeatother
\begin{document}
\begin{subequations}
\begin{align}
1 &= 1\\
2 &= 2
\end{align}
\end{subequations}
\begin{subequations}
\begin{align}
\BeginSubequationsGroup
1 &= 1\\
2 &= 2\\
\EndSubequationsGroup
3 &= 3\\
\BeginSubequationsGroup
4 &= 4\\
5 &= 5\\
\EndSubequationsGroup
6 &= 6
\end{align}
\end{subequations}
\begin{subequations}
\begin{align}
1 &= 1\\
2 &= 2
\end{align}
\begin{align}
\BeginSubequationsGroup
1 &= 1\\
2 &= 2
%\EndSubequationsGroup
\end{align}
\end{subequations}
\begin{subequations}
\begin{align}
1 &= 1\\
\BeginSubequationsGroup
2 &= 2\\
3 &= 3\\
\EndSubequationsGroup
4 &= 4\\
5 &= 5\\
\BeginSubequationsGroup
6 &= 6\\
7 &= 7\\
8 &= 8
\end{align}
\begin{align}
\EndSubequationsGroup
1 &= 1\\
2 &= 2
\end{align}
\end{subequations}
\end{document}
