But it compiles? I have tested it out of the box and it does so.
Julio Rojas

On Thu, Jan 5, 2012 at 11:39 AM, Wolfgang Engelmann <
engelm...@uni-tuebingen.de> wrote:

> I use
> \mathrm{K}^{+}
> to get an upright K^+ (K-Ion) (and other items such as units)
> and guess the following message on the terminal from which I start lyx has
> to do with it:
> [Unknown [sub [mathrm [char E mathalpha]] [char e mathalpha][char x
> mathalpha]]]
> Do I have to include some package or use another method?
> Wolfgang

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