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2406.12821

Lower box dimension of infinitely generated self-conformal sets

Amlan Banaji, Alex Rutar

correctmedium confidence
Category
Not specified
Journal tier
Strong Field
Processed
Sep 28, 2025, 12:56 AM

Audit review

The paper proves only an upper identity and sharp two-sided bounds for the lower box dimension, not the lower identity asserted by the model. Specifically, it shows max{dim_H Λ, dim_B F} ≤ dim_B Λ ≤ dim_B Λ = max{dim_H Λ, dim_B F} (their equation (1.4)) and classifies existence of box dimension by dim_B Λ = dim_B Λ iff dim_B F ≤ max{dim_H Λ, dim_B F} (Theorem B). It further provides an asymptotic formula for log N_r(Λ) that demonstrates the lower box dimension can strictly exceed max{dim_H Λ, dim_B F} in general. Thus the model’s Step 1 equalities (claiming dim_B Λ = max{dim_H Λ, dim_B F}) are false; the model’s final criterion matches the paper’s Theorem B but is derived from an incorrect premise. See the paper’s (1.4), Theorem B, and Theorem C for the correct statements and proof strategy.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} strong field

\textbf{Justification:}

The manuscript delivers a precise and sharp classification for the existence of box dimension in the CIFS setting and explains the mechanism via an asymptotic formula for covering numbers. It refines the classical MU framework by separating upper and lower behaviours and showing how the multiscale structure of the fixed-point set controls the liminf profile. The exposition is careful and technically competent, with room for minor improvements in guidance and examples.