> 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/no/latex-feil/02-command-r-invalid-in-math-mode-on-input-line-xxx.md).

# Kommandoen \r er ugyldig i mattmodus på innlinje XXX

Denne feilen vises når spesialtegn brukes feil i matemodus. I LaTeX kan visse tegn, som bokstaver med aksent eller bokstaver med omlyd, ikke skrives i matemodus. Den beste måten å løse dette på er å skrive dem inne i **`\text{...}`** som tilbys av **`amsmath`** pakken.

## Vanlige årsaker

**Inkludering av bokstaver med aksenter, omlyd osv. i matemodus:**

f.eks. er ö egentlig {\\"o}

**Bruk av spesialsymboler i matemodus:**

f.eks. er ångstrøm \AA egentlig \r{A}


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