Stably C1C^1 or stably fractal conjecture for Anosov systems

From papers

Let r2r\geq 2 and consider CrC^r Anosov diffeomorphisms, with their stable and unstable distributions. A distribution is stably C1C^1 if it remains C1C^1 under every sufficiently C1C^1-small perturbation, and stably fractal if every such perturbation has a distribution with a fractal graph. Stably C1C^1 or stably fractal conjecture for Anosov systems. Among CrC^r, r2r\geq 2, Anosov diffeomorphisms, there exists a C1C^1-open, CrC^r-dense set such that the stable or unstable distribution of each element is either stably C1C^1 or stably fractal. This is the Anosov counterpart of the proposed partially hyperbolic dichotomy, and the source gives no resolution.

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Primary source

Disheng Xu and Jiesong Zhang, “Invariant distributions of partially hyperbolic systems: fractal graphs, excessive regularity, and rigidity”, arXiv:2411.19665 (2025).

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