Weak Lie Symmetry and extended Lie algebra

Hubert F. M. Goenner

The concept of weak Lie motion (weak Lie symmetry) is introduced through ${\mathcal{L}}_{\xi }{\mathcal{L}}_{\xi }{g}_{ab}=0,$ (${\mathcal{L}}_{\xi }{\mathcal{L}}_{\xi }f=0$). Applications are given which exhibit a red…