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From: Marckus <news@marckus-kraft.de>
Newsgroups: comp.text.tex
Subject: Re: Amsmath problem
Date: Sun, 23 Jun 2024 18:29:40 +0200
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Hi!

If I compile your example I get the same error message too.

 > Bla bla $\mathrm{AuCl_4^−}$ and $\mathrm{TOA^+}$

Whilst disassembling your lines, I get an error code for the -:
Unicode character − (U+2212) not set up for use with LaTeX.

Does this help you?

Cheers
Marckus

Am 23.06.2024 um 16:49 schrieb db:
> I wrote this mini-example:
> 
> \documentclass[12pt,fleqn,A4,danish]{article}
> \usepackage{amsmath}
> \usepackage{graphicx}
> \usepackage[text={14cm,20cm},centering]{geometry}
> \begin{document}
> \title{Amsmath problem}
> \author{}
> \date{}
> \maketitle
> Bla bla $\mathrm{AuCl_4^−}$ and $\mathrm{TOA^+}$
> 
> \end{document}
> 
> and get this result:
> 
> ...
> ! Missing { inserted.
> <to be read again>
>                     \begingroup
> l.10 bla bla $\mathrm{AuCl_4^−}
>                                   $ and $\mathrm{TOA^+}$
> ?
> 
> On a suggestion of a friend I tried  ${\mathrm{AuCl_4^−}}$
> 
> with the same result. I also tried his suggestion
> to use mhchem, i.e.
> 
> \ce{[AuCl4]^-}
> 
> and this didn't work either (yes, I did add
> \usepackage{mhchem} )
> 
> This is supposed to work, and does on my
> friend's machine. Could this be a defective
> texlive, or am I really doing something
> wrong?
>