Theorem of Sternberg-Chen modulo central manifold for Banach spaces
Abstract:
We consider C∞-diffeomorphisms on a Banach space with a fixed
point 0. Suppose that these diffeomorphisms have C∞
non-contracting and non-expanding invariant manifolds, and formally
conjugate along their intersection (the center). We prove that they
admit local C∞ conjugation. In particular, subject to
non-resonance condition, there exists a local C∞ linearization
of the diffeomorphisms. It also follows that a family of germs with a
hyperbolic linear part admits a C∞ linearization, which has
C∞ dependence on the parameter of the linearizing family. The
results are proved under the assumption that the Banach space allows a
special extension of the maps. We discuss corresponding properties of
Banach spaces. The proofs of this paper are based on the technique,
developed in the works of G. Belitskii.