Generalized hyperbolicity for diffeomorphisms of Banach spaces

We introduce generalized hyperbolicity for nonlinear dynamics in Banach spaces.

The definition allows the stable/unstable splitting to be discontinuous and requires only inclusions, rather than equalities, in the invariance conditions for both subspaces.

On smooth compact manifolds, generalized hyperbolicity is equivalent to Axiom~A and the strong transversality condition, providing a finite-dimensional calibration of the proposed Banach-space theory.

For $C^1$-diffeomorphisms of the whole Banach space such that $Df$ and $D(f^{-1})$ are globally bounded and $Df$ is uniformly continuous, we establish the principal dynamical consequences of generalized hyperbolicity: Lipschitz shadowing, density of periodic points in the chain-recurrent set, and robustness under perturbations small in the uniform $C^1$ distance.

The shadowing result requires no continuity of the splitting, and shadowing trajectories need not be unique.

Under the additional assumption that the splitting is uniformly continuous, we prove semi-structural stability.

If, in addition, the subspace $E^s_x\oplus (Df(x))^{-1}E^u_{f(x)}$ is independent of $x$, we obtain structural stability.