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2108.09791

COMPARISON OF LIMIT SETS FOR THE ACTION OF KLEINIAN GROUPS IN CPn

Alejandro Ucan-Puc, Jose Seade

correctmedium confidence
Category
math.DS
Journal tier
Specialist/Solid
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper proves that for Veronese groups G = Sym^n(Γ) with Γ convex co-compact, the Kulkarni limit set equals the complement of the equicontinuity region and identifies that complement with the union of osculating hyperplanes H_x over x in Λ(Γ) (Theorem 0.1 and Theorem 3.8) . It also describes the equicontinuity complement via quasi-projective (pseudo-projective) limits and shows Eq(G) ⊂ Ω_Kul(G) (Proposition 1.1 and Proposition 1.4) . The candidate solution reproduces this structure: Step 1 gives Eq(G) as CP^n minus the kernels of quasi-projective limits specialized to the Veronese case (yielding the H_x), Step 2 notes Eq ⊂ Ω_Kul, and Step 3 proves the reverse inclusion using proximal/loxodromic dynamics. The dynamics argument is very close in spirit to the paper’s ––lemma/flag-based proof (Proposition 2.17 and Theorems 3.3, 3.8) . Minor differences of presentation (density of fixed-point pairs vs. conical points/KAK) do not affect correctness.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} specialist/solid

\textbf{Justification:}

The core results are correct and align with established techniques in the field. The identification of the equicontinuity complement with osculating hyperplanes and its coincidence with the Kulkarni limit set in the convex co-compact case is clearly stated and proved. Some proof steps (e.g., the final case analysis in Theorem 3.8) could be expanded for completeness, and a few references/definitions could be made more explicit, but these are presentational refinements.