2108.03211
Multiorders in amenable group actions
Tomasz Downarowicz, Piotr Oprocha, Mateusz Wiȩcek, Guohua Zhang
correctmedium confidence
- Category
- Not specified
- Journal tier
- Strong Field
- Processed
- Sep 28, 2025, 12:56 AM
- arXiv Links
- Abstract ↗PDF ↗
Audit review
The paper’s Theorem 7.4 correctly proves that for any multiorder and for ν-almost every order, the remote past along that order equals the Pinsker σ-algebra of the G-process; the proof is rigorous and uses relative entropy via the multiorder factor and a Z-action generated by the successor map. The model’s solution follows the paper’s structure but incorrectly assumes (without justification) that the multiorder factor has zero entropy under both the G- and the induced Z-actions, which is not true in general and is unnecessary for the theorem.
Referee report (LaTeX)
\textbf{Recommendation:} minor revisions
\textbf{Journal Tier:} strong field
\textbf{Justification:}
The work establishes a versatile multiorder framework and gives a clean, correct characterization of the Pinsker factor via random orders for amenable group actions. The arguments are sound and the exposition is largely clear. Minor enhancements to clarity (e.g., highlighting specific steps and standard references when invoked) would further aid readers, but no substantive changes are required.