I am working in Hebrew in LyX and I want it to switch to English automatically when I pass to Math mode. Is it possible?
This usually happens if you use your operating system keyboard layout for lyx instead of its own. See http://wiki.lyx.org/LyX/HebrewOnLinux:
The same instructions should work as well for Windows. After following them, you'll set the keyboard as English, and switch in LyX (it is a semi-convention to map