flyspell-check-tex-math-command

flyspell-check-tex-math-command is a variable defined in `flyspell.el'.
Its value is

nil

• This variable may be risky if used as a file-local variable.

Documentation:
Non-nil means check even inside TeX math environment.
TeX math environments are discovered by `texmathp', implemented
inside AUCTeX package. That package may be found at
URL `http://www.gnu.org/software/auctex/'

You can customize this variable.