auctex: Equations
2.4.1 Equations
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When inserting equation-like environments, the '\label' will have a
default prefix, which is controlled by the following variables:
-- User Option: LaTeX-equation-label
Prefix to use for 'equation' labels.
-- User Option: LaTeX-eqnarray-label
Prefix to use for 'eqnarray' labels.
-- User Option: LaTeX-amsmath-label
Prefix to use for amsmath equation labels. Amsmath equations
include 'align', 'alignat', 'xalignat', 'aligned', 'flalign' and
'gather'.