 
 (defcustom latex-unicode-math-mode-rules-generic
   '(
-    ;; Invert (see latex-unicode-math-invert-region) only works with
-    ;; replacements where the right-hand side is a single letter, not a
-    ;; one-letter string.  So we use one-letter strings for one-way
-    ;; replacements, where invert wouldn't make sense.
     ("~=" "≠")
     ("!=" "≠")
     ("\\not=" "≠")

    ("\\Phi" ?Φ)
    ("\\Psi" ?Ψ)
    ("\\Omega" ?Ω))
  "Greek letters for `latex-unicode-math-mode'."
  :type '(repeat (list :tag "Rule"
                       (string :tag "Input")
                       (choice :tag "Output" string character)))


(defcustom latex-unicode-math-mode-rules-extra
  nil
  "Extra rules for `latex-unicode-math-mode'.
Please add your own rules here."
  :type '(repeat (list :tag "Rule"
                       (string :tag "Input")
                       (choice :tag "Output" string character)))
