Arnold Neumaier wrote:
> In general, the symmetry group of a conservative physical system is
> that of the action, and not that of the Lagrangian.
More generally it's the symmetry group of the functional derivative of
the action.
--
Hendrik van Hees Texas A&M University
Phone: +1 979/845-1411 Cyclotron Institute, MS-3366
Fax: +1 979/845-1899 College Station, TX 77843-3366
http://theory.gsi.de/~vanhees/ mailto:hees@comp.tamu.edu