\eqref
Another case where one only
wants to change the information associated with the label
category is to change the macro which is used for referencing the
label. When working with the AMS-LaTeX stuff, you might prefer
\eqref for doing equation references. Here is how to
do this:
(setq reftex-label-alist '((nil ?e nil "~\\eqref{%s}" nil nil)))
RefTeX has also a predefined symbol for this special purpose. The following is equivalent to the line above.
(setq reftex-label-alist '(AMSTeX))
Note that this is automatically done by the amsmath.el style file of AUCTeX (see Style Files) - so if you use AUCTeX, this configuration will not be necessary.