> For the complete documentation index, see [llms.txt](https://overleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overleaf-pro.ayaka.space/latex/fr/erreurs-latex/02-command-r-invalid-in-math-mode-on-input-line-xxx.md).

# La commande \r est invalide en mode mathématique à la ligne d’entrée XXX

Cette erreur apparaît lorsque des caractères spéciaux sont utilisés incorrectement en mode math. En LaTeX, certains caractères tels que les lettres accentuées, ou les lettres avec des trémas, ne peuvent pas être écrits en mode math. La meilleure façon de résoudre cela est de les écrire à l'intérieur de la **`\text{...}`** fournies par le **`amsmath`** package.

## Causes courantes

**Inclure des lettres accentuées, des trémas, etc. en mode mathématique :**

par ex. ö est en réalité {\\"o}

**Utilisation de symboles spéciaux en mode mathématique :**

par ex. angstrom \AA est en réalité \r{A}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://overleaf-pro.ayaka.space/latex/fr/erreurs-latex/02-command-r-invalid-in-math-mode-on-input-line-xxx.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.