From inside Emacs, first evaluate:
- Code: Select all
You need to evaluate (require 'cl), because the Emacs "set-difference" and "intersection" functions are defined in "cl-seq.el", that is no standard part of Emacs, then try:
- C-h f set-difference
- C-h f intersection
and click on the source links in the *Help* buffer. The source links work of course only if the Emacs sources are installed.