Back to search
2506.14032

Adding machines and open dynamical systems

F. Ciavattini, T. H. Steele

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

Audit review

The paper proves residual indecisiveness on the minimal Cantor part Q of a genus‑1 maximal ω‑limit set, then asserts it is residual on ω(x)=Q ⊔ C “as C is countable,” but C consists of isolated (hence open) points, so countability alone does not make C meager; the extension step is unjustified (structure of ω(x) and the Q ⊔ C decomposition is recalled in the paper’s Section 1, and Theorem 12’s proof contains this step). Definition 3 also appears to have a typo, taking an intersection over j=1,2,… instead of i=1,…,N. The model’s solution, while giving a plausible odometer/partition-based argument, incorrectly assumes ω(x) itself is a Cantor minimal set (it can have a countable set of isolated points), and it never addresses those isolated points. Therefore, both arguments have gaps. See the paper’s definitions/results and the solenoidal-set structure: Definition 3 and 6; Theorem 12 and its proof; and the description of ω(x)=Q ⊔ C with C countable and consisting of isolated points.

Referee report (LaTeX)

\textbf{Recommendation:} major revisions

\textbf{Journal Tier:} specialist/solid

\textbf{Justification:}

The paper’s objective—showing residual indecisiveness for adding machines and for genus‑1 solenoidal subsystems—is natural and relevant. The adding‑machine part is clean via transitive homeomorphisms. However, in the solenoidal/genus‑1 case, the argument only establishes residuality on the minimal Cantor core Q and then extends to ω(x)=Q ⊔ C purely by countability of C. Since C consists of isolated points (open singletons), countability is not enough to conclude meagerness in a Baire space; one must show C ⊆ T or otherwise handle C directly. There is also a small definition typo for T and an undefined S\_N. With these fixes, the contribution would be solid.