In Emacs I frequently use math symbols when I write my theory summaries of math textbooks. I use org-mode to structure information and I know about at least two methods of enter
There's also latex-pretty-symbols, which may be a bit less finnicky.
M-x set-input-method
RET TeX
sounds like what you want.
View available symbols by executing M-x describe-input-method
RET TeX
(or its binding C-h I
).
If you'll want to use this often, you can customize the variable default-input-method
and set it to TeX
. That way, you can activate the input method with C-\
(for toggle-input-method
) in any buffer where you need it.