> 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/it/errori-latex/02-command-r-invalid-in-math-mode-on-input-line-xxx.md).

# Comando \r non valido in modalità matematica alla riga di input XXX

Questo errore appare quando i caratteri speciali vengono usati in modo scorretto in modalità matematica. In LaTeX, alcuni caratteri come le lettere accentate o le lettere con umlaut non possono essere scritti in modalità matematica. Il modo migliore per risolvere il problema è scriverli all'interno di **`\text{...}`** fornite dal **`amsmath`** pacchetto.

## Cause comuni

**Includere lettere con accenti, umlaut ecc. in modalità matematica:**

ad es. ö in realtà è {\\"o}

**Uso di simboli speciali in modalità matematica:**

ad es. angstrom \AA in realtà è \r{A}


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