arXiv:2607.15960v1

Operator ergodic theorems with Möbius "weights"

El Houcein El Abdalaoui, Michael Lin

math.DS47A3537B4011N3711L0737A44

Abstract

Motivated by Sarnak's conjecture in topological dynamics for the Möbius function μμ, we study, for a power-bounded TT on a Banach space EE, the weak convergence ()1Nn=1Nμ(n)Tnv0 weakly vE. (*) \qquad \qquad \frac1N\sum_{n=1}^N μ(n)T^nv \to 0 \text{ weakly } \forall v\in E. For that, we introduce a notion of dynamical entropy for operators, which we denote htop(T)h^*_{top}(T), and show that if Sarnak's conjecture is true, then htop(T)=0h^*_{top}(T)=0 implies the desired convergence (*). We conclude an equivalent operator formulation of Sarnak's conjecture. For several classes of operators we prove that (*) holds, and that htop(T)=0h^*_{top}(T)=0.

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Audited against arXiv v1

Not a correctness certificate. A “Correct” result may include yellow typos or minor formal corrections that do not affect substantive soundness. It means this audit found no unresolved substantive error under the stated criteria; it does not replace expert scrutiny or formal verification.

Current report

Detailed mathematical audit

Generated August 18, 2026
01Statements2 reported findingsContains wrong statements

The main operator formulation and most zero-entropy implications are supported, but Proposition 3.16's asserted closure of zero-entropy contractions under multiplication is false.

Theorems 2.1, 2.6, 2.11, 3.6, and 3.7Correct

The central Möbius-weight and operator-entropy implications

Pages 4–15 · principal theorems · arXiv:2607.15960v1

The weakly almost periodic decomposition, polynomially bounded estimates, tame-system argument, natural-extension comparison, and reduction to separable cyclic subspaces support the stated Möbius-weight conclusions and the equivalence with Sarnak's conjecture.

Proposition 3.16Incorrect

Zero operator entropy is not stable under multiplication

Page 17 · Proposition 3.16 · arXiv:2607.15960v1

On 1(Z)\ell^1(\mathbb{Z}), let Aen=enAe_n=e_{-n} and Ben=e1nBe_n=e_{1-n}. Both AA and BB are involutive isometries, so their dual actions are period two and have zero topological entropy. But ABen=en1ABe_n=e_{n-1}, the bilateral shift, whose dual action on the unit ball contains the full two-symbol shift and has positive entropy, exactly as the paper's Proposition 3.3 observes. Hence the multiplication-closure assertion is false.

02Proofs2 reported findingsContains incorrect or incomplete proofs

The proof of Proposition 3.16 relies on a nonexistent factor relation between the dual of a convex combination or product and the product of the two dual systems.

Proposition 3.16Incorrect as written

The proposed factor map does not intertwine the dynamics

Page 17 · proof of Proposition 3.16 · arXiv:2607.15960v1

For the natural map π(φ,ψ)=aφ+(1a)ψ\pi(\varphi,\psi)=a\varphi+(1-a)\psi, applying T×ST^*\times S^* and then π\pi gives aTφ+(1a)SψaT^*\varphi+(1-a)S^*\psi. Applying aT+(1a)SaT^*+(1-a)S^* after π\pi introduces cross terms, so π\pi is not a factor map. There is likewise no displayed intertwining map for TSTS. The explicit involution counterexample shows that this is not a merely missing detail and that no repair can preserve the proposition as stated.

Proposition 3.18Minor formal correction · no status impact

An orbit closure is called equal to a larger factor image

Pages 18–19 · proof of Proposition 3.18 · arXiv:2607.15960v1

For fixed φ\varphi, the orbit closure K(v,φ)K(v,\varphi) is generally a subset of πv(B)\pi_v(B), not equal to it. Replacing ‘coincides with’ by ‘is an invariant subset of’ gives the same entropy inequality, because entropy decreases first under the factor Bπv(B)B\to\pi_v(B) and then under restriction to K(v,φ)K(v,\varphi).

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2607.15960v1
Authors listed
El Houcein El Abdalaoui, Michael Lin
Audit date
August 18, 2026
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