Redefining format for \autoref for equations causes unwanted format for subequations

Question

In order to be able to reference the equations in my thesis in the format like "Equation (2.2.3)" using the \autoref command I added the following lines in my preamble:

\makeatletter
\let\oldtheequation\theequation
\renewcommand\tagform@[1]{\maketag@@@{\ignorespaces#1\unskip\@@italiccorr}}
\renewcommand\theequation{(\oldtheequation)}
\makeatother

as suggested in Mico's answer in this post: autoref and braces around equation number.

This works perfectly for most of the equations but changes the format of the subequations from the standard format like "(2.3.1a)" to "(2.3.1)a". I want to keep to original format for such subequations. Namely, I want the letter to be inside the parentheses. How can I achieve this?

MWE:

\documentclass[12pt]{report}
\usepackage{amsmath}
\usepackage{hyperref}
\numberwithin{equation}{section}
\makeatletter
\let\oldtheequation\theequation
\renewcommand\tagform@[1]{\maketag@@@{\ignorespaces#1\unskip@@italiccorr}}
\renewcommand\theequation{(\oldtheequation)}
\makeatother
\begin{document}
\chapter{Test Chapter}
\section{Test Section}
This is a test equation two including subequations:
\begin{subequations} \label{Eq:MainEquation}
    \begin{equation} \label{Eq:SubEquation1}
        E = mc^2
    \end{equation}
    \begin{equation} \label{Eq:SubEquation2}
        c^2 = a^2 + b^2
    \end{equation}
\end{subequations}
As seen in \autoref{Eq:MainEquation} the labels for \autoref{Eq:SubEquation1} and \autoref{Eq:SubEquation2} are in the wrong format. The letters for the subequations should be inside the parentheses.
\end{document}

Screenshot illustrating the problem:

don't show only snippets. Always show a small but complete example. That makes it much easier to test solutions. — Ulrike Fischer, Jun 09 '21 at 08:34
@UlrikeFischer Thank you for your feedback! I have now added a MWE and a screenshot illustrating the problem to the original question. — thisismetrying, Jun 09 '21 at 09:49
The "dirty hack" second answer in the linked question worked for me: \def\equationautorefname#1#2\null{Equation#1(#2\null)}, but I'm not sure the limitations of the hack. — jessexknight, Jun 09 '21 at 12:14
@jessexknight Yes it did! Doesn't seem to have any unwanted bieffects so far. Should have noticed this earlier... However, thank you! — thisismetrying, Jun 09 '21 at 12:29
@jessexknight You can provide your comment as an answer and I can award you the bounty! — thisismetrying, Jun 10 '21 at 14:38
Sure, but let me try to understand the limitations first. I've asked "Bart" in the other question to clarify. — jessexknight, Jun 10 '21 at 18:10

score 0 · Accepted Answer · answered Jun 12 '21 at 14:59

A workaround by redefining the subequations environment from amsmath.

\documentclass[12pt]{report}
\usepackage{amsmath}
\usepackage{hyperref}
\numberwithin{equation}{section}
\makeatletter
\let\oldtheequation\theequation
\renewcommand\tagform@[1]{\maketag@@@{\ignorespaces#1\unskip@@italiccorr}}
\renewcommand\theequation{(\oldtheequation)}
\renewenvironment{subequations}{%
  \refstepcounter{equation}%
  % old
  % \protected@edef\theparentequation{\theequation}%
  \protected@edef\theparentequation{\oldtheequation}%
  \setcounter{parentequation}{\value{equation}}%
  \setcounter{equation}{0}%
  % old
  % \def\theequation{\theparentequation\alph{equation}}%
  \def\theequation{(\theparentequation\alph{equation})}%
  \ignorespaces
}{%
  \setcounter{equation}{\value{parentequation}}%
  \ignorespacesafterend
}
\makeatother
\begin{document}
\chapter{Test Chapter}
\section{Test Section}
\makeatletter
This is a test equation two including subequations:
\begin{subequations} \label{Eq:MainEquation}
    \begin{equation} \label{Eq:SubEquation1}
        E = mc^2
    \end{equation}
    \begin{equation} \label{Eq:SubEquation2}
        c^2 = a^2 + b^2
    \end{equation}
\end{subequations}
As seen in \autoref{Eq:MainEquation} the labels for \autoref{Eq:SubEquation1} and \autoref{Eq:SubEquation2} are in the wrong format. The letters for the subequations should be inside the parentheses.
\end{document}

Redefining format for \autoref for equations causes unwanted format for subequations

1 Answers1

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