I'm a little new to emacsEmacs. When looking at some of the configurations, I found there are two types command in "add-hook".
(add-hook 'LaTeX-mode-hook #'LaTeX-math-mode)
and
(add-hook 'LaTeX-mode-hook 'LaTeX-math-mode)
This has confused me for a long time and I don't know how to search "#'" in google...
Thanks.