Hicham Mouline schrieb:
I have created a system of equations (the cases environment) with 10 columns and 9 rows.Many of the cells are empty.After saving the .lyx, and on clicking on the dvi or pdf icon, I get this error repeated 27 times:Extra alignment tab has been changed to \cr
Then you have done something wrong when creating the formula. When you send a _small_ LyX example file I can have a look.
regards Uwe
