Am Donnerstag, 27. Oktober 2016 um 14:40:03, schrieb Paul A. Rubin
<parubi...@gmail.com>
> On 10/27/2016 12:10 PM, Mario D wrote:
> > Hi all,
> >
> > I have a file on which I am currently working. It compiled fine under
> > lyx 2.2.1.
> > Today I upgraded to lyx 2.2.2 and compiling the very same file results
> > in an error which I previously didn't experience.
> > The error is as follows:
> >
> > -------------------------------------------------
> > Undefined control sequence
> >
> > Let $\sigma\left(f\right)\coloneqq
> >
> > f\left(x_{\sigma\left(1\right)}...
> >
> > The control sequence at the end of the top line
> >
> > of your error message was never \def'ed. If you have
> >
> > misspelled it (e.g., `\hobx'), type `I' and the correct
> >
> > spelling (e.g., `I\hbox'). Otherwise just continue,
> >
> > and I'll forget about whatever was undefined.
> >
> > --------------------------------------------------
> >
> >
> > In other words, the control sequence \coloneqq which was previously
> > known to lyx, is not known any longer.
> >
> >
> > What is happening?
> >
> >
> > TIA
> >
> >
> I just type \coloneqq in a math inset in LyX 2.2.2 and LyX recognized it
> (but pdflatex bombed on it with the same error you saw). So I went to
> Document > Settings > Math Options and changed "mathtools" from "Load
> automatically" to "Load always", and the document compiled. Maybe LyX
> lost the ability to recognized that \coloneqq requires mathtools (or one
> of a few other packages)?
>
> Paul
>
You found a bug. I tried with lyx2.2, it is reproducible. Lyx2.3dev works fine
again though.
Kornel
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