A Co-Chain Map on the G-invariant de Rham Complex
Contribution to Book
Symmetry and Perturbation Theory
We characterize Lie group actions for which there exists, at least locally, an evaluation map that defines a cochain map from the differential complex of invariant forms on a manifold to the De Rham complex for the quotient.
A co-chain map on the G-invariant de Rham complex, (with M. Fels), in Symmetry and Perturbation Theory 2004, 1-12, Sardinia Italy, World Scientific, ISBN 981-256-136-6.