nLab
symmetry

Contents

Idea

A symmetry is (in most classical situations) invariance under a group action, or infinitesimally, invariance under a Lie algebra action.

In physics, see local symmetry, global symmetry, spontaneous symmetry breaking.

Revised on December 17, 2014 22:32:31 by Urs Schreiber (127.0.0.1)