Yesterday I wrote :
I am working in LyX with documentclass{amsart}
and all was doing well until MiKTeX Update made impossible to produce PDF output, error messages being
amscls.sty
not found or- Undefined control sequence
\ifpgfmath@isprime
Any idea of what's going on?
In fact, after spending time to test compatibility between amsart
(\documentclass{amsart}
) and other declared packages (\usepackage{'package'}
), I found amsart in conflict with igo package (who knows why), and deleting the latter seems to have erased the bug ; the 'view' command (Ctrl+R) is still disabled, but the 'view other formats' command is that far functional, so it looks like doing well again.