Initial Query

In latex when I force a newline in a caption with \\ it gives an error saying \Hy@tempa has an extra } runaway argument?

LLM Generation

Query

In latex when I force a newline in a caption with \\ it gives an error saying \Hy@tempa has an extra } runaway argument?

Output

The error occurs because the `\\` command is fragile in moving arguments like captions, especially when using the `hyperref` package. Here's how to fix it: **Solution:** Use `\protect\\` to safely insert a line break in the caption. **Example:** 

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\documentclass{article}
\usepackage{hyperref} % For hyperlinks
\begin{document}
\begin{figure}
  \caption{First line \protect\\ Second line}
\end{figure}
\end{document}
**Explanation:** - **Fragile Commands:** Commands like `\\` can break during LaTeX's expansion process in moving arguments (e.g., captions, section titles). - **`\protect`:** Prevents premature expansion of `\\` when the caption is processed by `hyperref` for hyperlinks/bookmarks. - **Alternatives:** Use `\newline` (inherently robust) instead of `\\`, or use the `caption` package for advanced formatting. **For Multiple Line Breaks:** 
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\caption{Line 1 \protect\\ Line 2 \protect\\ Line 3}
This ensures LaTeX handles the line breaks correctly without errors.

Substring Evaluation

Testing if the previous output contains the string \protect: True