> > > For example, the tex file has:
> > > $-$u user

The tex file should have "--", not "$-$"!

> > > But lyx shows it as:
> > >
> > > - u user

And does so correctly, as math mode contents are surrounded by a small margin 
IIRC.

> > Are you sure that there is really a 
> > space in lx and not just the usual margin of the math box?
>
> I don't know about math mode nor a math box. I never (knowingly) enabled
> it.

$-$ is a minus operator in math mode. It's wrong to use it as a medium dash. 
Type -- instead.

> This tex file was created by running html2latex on the output from "groff
> -Thtml".

Then html2latex creates broken output, i.e. emits minus operators instead of 
medium dashes.

Cheers, Kuba Ober

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