2404.13642
CAN POINTS OF BOUNDED ORBITS SURROUND POINTS OF UNBOUNDED ORBITS ?
JIEHUA MAI, ENHUI SHI, KESONG YAN, FANPING ZENG
correcthigh confidence
- Category
- Not specified
- Journal tier
- Specialist/Solid
- Processed
- Sep 28, 2025, 12:56 AM
- arXiv Links
- Abstract ↗PDF ↗
Audit review
The paper proves that for any disk E ⊂ R^2 there is a plane homeomorphism h with bounded orbits on ∂E and doubly divergent orbits on Int(E), via a construction on J^2 using normally rising homeomorphisms (Theorems 1.2 and 3.5) and a conjugacy pipeline employing a semi-conjugacy ξ, a coordinate blow-up ψ, and the Schönflies theorem ζ . The candidate solution gives a different, explicit construction: h = u ∘ T where T is a translation and u is a compactly supported shear inverse that fixes ∂E pointwise and leaves all interior orbits asymptotically like T in both time directions, hence doubly divergent. The argument is sound; minor technical points (e.g., support of u vs. j) are easily patched. Thus both the paper and the model are correct, with substantially different proofs.
Referee report (LaTeX)
\textbf{Recommendation:} minor revisions \textbf{Journal Tier:} specialist/solid \textbf{Justification:} The manuscript demonstrates, with a carefully crafted construction on J\^2 and subsequent conjugacies, that a disk’s boundary can consist entirely of bounded orbits while its interior points all have doubly divergent orbits. The approach is technically sound and leverages a novel class of ‘normally rising’ homeomorphisms to encode prescribed limit-set behavior. Some steps—particularly the definition and properties of the semi-conjugacy ξ leading to the homeomorphism g—would benefit from fuller exposition and an accompanying figure, but these are presentational refinements rather than correctness issues.