Am Donnerstag, 5. Januar 2012, 14:53:38 schrieb Guenter Milde: > On 2012-01-05, Wolfgang Engelmann 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? > > I cannot reproduce this. No messages appear on my terminal (LyX svn on > Debian Linux started from x-terminal emulator).
The reason for the error messages was not the \mathrm{K}^{+} in the text, as a minimal example showed, but an entrance in a reference, which I got from a data bank. Shame on me, I should have checked first with and without bibliography. Thanks Guenter and Julio, Wolfgang