Gourt Home::Gourt :: Local symmetry
In physics, a local symmetry is a symmetry that holds on an open subset of points on a spacetime, as opposed to a global symmetry which holds at all points.
Most physical theories are described by Lagrangians which are invariant under certain transformations, where the transformations are an arbitrary function of each space-time point—they have local symmetries, or gauge symmetries
See also
"Local symmetry"