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2203.16283

UNIFORM SOLVABILITY FOR FAMILIES OF LINEAR SYSTEMS ON TIME SCALES

Sergey Kryzhevich

incompletemedium confidence
Category
Not specified
Journal tier
Specialist/Solid
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper’s Theorem 2 is stated and only sketched: it reduces the time‑scale system to an ODE via the renormalization s(t) and the logarithm/cylinder transform, then appeals to an external ODE result of Pliss to assert a uniformly bounded Green operator, without detailing the multi‑interface solvability or operator bounds (see the reduction formulas (4.3) and Lemma 1, and the brief proof of Theorem 2) . The candidate solution fills many gaps (uniform bounds on B and g; dichotomy/transversality; continuity in ν), but its concatenation step incorrectly applies a one‑junction half‑line argument to a right‑hand side that is only piecewise hyperbolic, not globally hyperbolic on a half‑line. It thus needs a corrected multi‑junction algebraic matching argument. Therefore, the paper’s argument is a sketch relying on external results, and the model’s proof is close but has a logical gap in Step 3.

Referee report (LaTeX)

\textbf{Recommendation:} major revisions

\textbf{Journal Tier:} specialist/solid

\textbf{Justification:}

The paper addresses an important step toward structural stability on time scales and introduces a clean reduction to ODEs via renormalization. However, the core linear solvability theorem (Theorem 2) is proved only at the level of a sketch, with the multi-interface ODE solvability delegated to external literature without precise statements or verification of hypotheses. Expanding this part to include a fully spelled-out construction (or a precise citation with assumptions matched) is necessary for correctness and accessibility.