"LaTeX3 Error: Command '\textsi' not yet defined!"

David Pesetsky pesetsk at mit.edu
Sun Feb 16 14:33:46 UTC 2020

Thanks.  Is there a way to stop LaTeX3 from compiling the file?  In fact, independent of using or not using this package, since starting to use Lyx again a day ago, no matter what I compile, I periodically see the message "L3 Programming Layer <date>" on the status bar at the bottom of the Lyx window.

MacOS Catalina 10.15.3


On Feb 16, 2020, at 6:34 AM, Richard Kimberly Heck <rikiheck at lyx.org<mailto:rikiheck at lyx.org>> wrote:

On 2/15/20 5:52 PM, David Pesetsky wrote:
I was using Lyx for Mac rather extensively to write a long-ish manuscript about a year ago, but have been away from it for a while.

In the interval, a problem has arisen, though nothing has changed in my setup besides updating Lyx and Latex via TexLive.  I install the embrac package, which ensures non-italic brackets in otherwise italicized environments.  This used to work without a problem, but now generates the error message:

LaTeX3 Error: Command '\textsi' not yet defined!

I am sure of my trouble-shooting, since commenting out the usepackage command eliminates the error.

This is pretty suspicious. It suggests, to me, that LaTeX3 is being used to compile this file, which will almost certainly cause major problems with LyX. Then again, it's possible that the problem is just local to the embrac package. You might try writing the maintainer at contact at mychemistry.eu<mailto:contact at mychemistry.eu>.


David Pesetsky [pesetsk at mit.edu<mailto:pesetsk at mit.edu>]
Department of Linguistics and Philosophy
32-D862 Massachusetts Institute of Technology
77 Massachusetts Avenue
Cambridge, MA 02139 USA
(617) 253-0957 office           (617) 253-5017 fax

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