Smooth and Algebraic Invariants of a Group Action: Local and Global Constructions

We provide an algebraic formulation of the moving frame method for constructing local smooth invariants on a manifold under an action of a Lie group. This formulation gives rise to algorithms for constructing rational and replacement invariants. The latter are algebraic over the field of rational invariants and play a role analogous to Cartan’s normalized invariants in the smooth theory. The algebraic algorithms can be used for computing fundamental sets of differential invariants.

• Type: Journal
• Year: 2007
• Where: FOCM
• Authors: Evelyne Hubert, Irina A. Kogan
• Keywords: Algebraic Formulation, FOCM 2007, Local Smooth Invariants, Replacement Invariants