arXiv:2508.17193v2

On a family of pseudo-Anosov-like maps on the infinite ladder surface

Nikita Agarwal, Rohan Suresh Mahure, Kashyap Rajeevsarathy

math.GTmath.DSmath.PR37A0557K2037A4037B10

Abstract

Let SgS_g be the closed surface of genus gg, L\mathcal{L} be the infinite Jacob's ladder surface, and Map(S)\mathrm{Map}(S) denote the mapping class group of a surface SS. Let qg:LSgq_g:\mathcal{L}\to S_g be the regular infinite-sheeted cover with deck transformation group Z\mathbb{Z}. In this paper, we show the existence of ``pseudo-Anosov-like'' maps on L\mathcal{L} that arise as the lifts of Penner-type pseudo-Anosov maps on SgS_g under the cover qgq_g. Furthermore, we establish that these lifts are topologically transitive, mixing, and support null recurrent dynamics. Moreover, we present concrete examples of infinite families of such maps on L\mathcal{L}.

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Audited against arXiv v2

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.

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Detailed mathematical audit

Generated August 18, 2026
01Statements2 reported findingsContains unsupported statements

The central null-recurrence and mixing conclusions are not established. The proof of irreducibility and aperiodicity is circular, and the later ergodicity–conservativity–recurrence chain assumes properties that it is meant to prove.

Theorem 3Not able to verify

Null recurrence of the symbolic system is not established

Pages 6–7 and 22–25 · Theorem 3 and Theorems 4.15–4.22 · arXiv:2508.17193v2

Theorem 3 depends on irreducibility, aperiodicity, ergodicity, and conservativity of the countable-state Markov shift. The proofs of those inputs are circular or incomplete as detailed below, so the claimed null recurrence cannot be verified from the manuscript.

Theorem 4.17Not able to verify

Mixing depends on an unproved irreducibility/aperiodicity assertion

Pages 22–23 · Theorems 4.15 and 4.17 · arXiv:2508.17193v2

The mixing conclusion invokes the irreducible and aperiodic transition matrix from Theorem 4.15. That theorem does not prove those properties, so the dependency leaves mixing unsupported.

02Proofs2 reported findingsContains incorrect or incomplete proofs

Two decisive proof chains are circular: Theorem 4.15 assumes the matrix properties it announces, and Theorems 4.20–4.22 move from irreducibility to ergodicity and conservativity without establishing recurrence.

Theorem 4.15Incomplete as written

Irreducibility and aperiodicity are assumed in their own proof

Page 22 · proof of Theorem 4.15 · arXiv:2508.17193v2

The relevant step begins with ‘Since M is a non-negative irreducible and aperiodic matrix’ and then derives consequences of exactly those properties. No preceding argument proves them for the matrix under study. This is circular and leaves Theorem 4.17 without its required hypothesis.

Theorems 4.20–4.22Incomplete as written

Ergodicity, conservativity, and recurrence are inferred in a circular order

Pages 24–25 · proofs of Theorems 4.20–4.22 · arXiv:2508.17193v2

Positive intersections of cylinder sets from irreducibility do not by themselves establish ergodicity of an infinite-state Markov shift. The next theorem uses that asserted ergodicity and non-atomicity to deduce conservativity, and the following theorem then uses conservativity to infer recurrence. Because recurrence is precisely the missing condition that controls the conservative/dissipative alternative, this chain does not close. No repair is supplied.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2508.17193v2
Authors listed
Nikita Agarwal, Rohan Suresh Mahure, Kashyap Rajeevsarathy
Audit date
August 18, 2026
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