Error When Using Changes Package With Amsmath Package If The Beginning Of \added{} Argument Is An Equation

Mar 12, 2025 by ADMIN 107 views

Error when using changes package with amsmath package if the beginning of \added{} argument is an equation

The changes package is a popular tool for tracking changes in LaTeX documents. It provides a convenient way to highlight additions, deletions, and modifications made to the document. However, when used in conjunction with the amsmath package, which is a widely used package for typesetting mathematical equations, users may encounter errors. In this article, we will discuss the issue of errors occurring when using the changes package with the amsmath package, specifically when the beginning of the \added{} argument is an equation.

When compiling a document that uses both the changes and amsmath packages, users may encounter an error if the beginning of the \added{} argument is an equation. This error is caused by the way the changes package processes the argument of the \added{} command. The changes package uses the amsmath package's equation environment to typeset equations, but it does not properly handle the case where the equation is the beginning of the \added{} argument.

The error message that users may encounter when compiling a document with this issue is:

! Argument of \__changes_add:nn has an extra }.
<argument> ... \end{equation}

This error message indicates that there is an extra } in the argument of the \__changes_add:nn command, which is a command defined by the changes package.

The cause of this error is the way the changes package processes the argument of the \added{} command. When the changes package encounters an equation as the beginning of the \added{} argument, it tries to typeset the equation using the amsmath package's equation environment. However, the changes package does not properly handle the case where the equation is the beginning of the \added{} argument, leading to an extra } in the argument of the \__changes_add:nn command.

To solve this issue, users can use the fragile option when loading the changes package. This option tells the changes package to use a fragile version of the \added{} command, which can handle equations as the beginning of the argument.

\usepackage[fragile]{changes}

Alternatively, users can use the amsmath package's equation* environment instead of the equation environment to typeset equations. The equation* environment does not produce an equation number, and it can be used as the beginning of the \added{} argument without causing an error.

\begin{equation*}
\added{...}
\end{equation*}

In conclusion, the changes package can cause errors when used in conjunction with the amsmath package, specifically when the beginning of the \added{} argument is an equation. However, by using the fragile option when loading the changes package or by using the amsmath package's equation* environment, users can avoid this issue and use the changes package with the amsmath package without encountering errors.

Here is an example use case that demonstrates the issue and the solution:

\documentclass[final]{article}
\usepackage{amsmath}
\usepackage[fragile]{changes}
\begin{document}
\begin{equation}
\added{This is an equation}
\end{equation}
\end{document}

In this example, the changes package is loaded with the fragile option, and the \added{} command is used to highlight an equation. The document compiles without errors, and the equation is highlighted as expected.

If users encounter errors when using the changes package with the amsmath package, they can try the following troubleshooting steps:

Check the error message to see if it indicates an extra } in the argument of the \__changes_add:nn command.
Check if the changes package is loaded with the fragile option.
Check if the equation is the beginning of the \added{} argument.
Try using the amsmath package's equation* environment instead of the equation environment to typeset equations.

By following these troubleshooting steps, users can identify and fix the issue and use the changes package with the amsmath package without encountering errors.
Error when using changes package with amsmath package if the beginning of \added{} argument is an equation: Q&A

In our previous article, we discussed the issue of errors occurring when using the changes package with the amsmath package, specifically when the beginning of the \added{} argument is an equation. We also provided a solution to this issue by using the fragile option when loading the changes package or by using the amsmath package's equation* environment. In this article, we will provide a Q&A section to address some common questions related to this issue.

A: The cause of the error is the way the changes package processes the argument of the \added{} command. When the changes package encounters an equation as the beginning of the \added{} argument, it tries to typeset the equation using the amsmath package's equation environment. However, the changes package does not properly handle the case where the equation is the beginning of the \added{} argument, leading to an extra } in the argument of the \__changes_add:nn command.

A: To fix the error, you can use the fragile option when loading the changes package. This option tells the changes package to use a fragile version of the \added{} command, which can handle equations as the beginning of the argument.

\usepackage[fragile]{changes}

Alternatively, you can use the amsmath package's equation* environment instead of the equation environment to typeset equations. The equation* environment does not produce an equation number, and it can be used as the beginning of the \added{} argument without causing an error.

\begin{equation*}
\added{...}
\end{equation*}

A: The equation environment in the amsmath package produces an equation number, while the equation* environment does not produce an equation number. The equation* environment is used to typeset equations that do not have an equation number.

A: Yes, you can use the changes package with the amsmath package without encountering errors by using the fragile option when loading the changes package or by using the amsmath package's equation* environment.

A: Here are some common troubleshooting steps for this issue:

Check the error message to see if it indicates an extra } in the argument of the \__changes_add:nn command.
Check if the changes package is loaded with the fragile option.
Check if the equation is the beginning of the \added{} argument.
Try using the amsmath package's equation* environment instead of the equation environment to typeset equations.

A: Yes, you can use the changes package with other math packages besides the amsmath package. However, you may need to use the fragile option when loading the changes package or use the math package's equivalent of the equation* environment.