Abstract

We build quantitative measure subgroup couplings from a Brieussel-Zheng diagonal product to a lamplighter group. We use them to answer the inverse problem of the quantification; namely, find a group admitting a measure subgroup coupling with a prescribed group with prescribed quantification, in the case of the lamplighter group.

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Audited against arXiv v3

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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Generated August 18, 2026
01Statements2 reported findingsCorrect

The inverse construction of one-to-one quantitative measure subgroup couplings from suitable diagonal products to lamplighter groups is correct with the stated near-optimal integrability.

Theorem 1.3Correct

Prescribed isoperimetric growth is realized by the quantitative coupling

Pages 4–5 and Section 4 · arXiv:2205.12137v3

The Brieussel–Zheng parameters produce a diagonal product GG with IGρlogI_G\simeq\rho\circ\log. Finite quotients of GG and the lamplighter group are coupled by explicit injections that preserve labelled balls on radii tending to infinity. The sofic-coupling criterion turns these finite maps into an at-most-one-to-one measure subgroup coupling, and the tail estimate for the cocycle gives ρ1ε\rho^{1-\varepsilon}-integrability for every ε>0\varepsilon>0. The monotonicity theorem shows this is optimal up to the announced exponent loss.

Full paper, version 3
Theorem 1.3Correct

The coupled sofic approximation retains both local convergence and metric growth

Introduction and final construction · arXiv:2205.12137v3

The diagonal-product approximation is locally modeled on the target group while the added components force the announced isoperimetric profile. The coupling map has the required injectivity radius on a density-one set, and its displacement tail matches the stated integrability estimate.

02Proofs2 reported findingsCorrect

The diagonal-product, sofic-approximation, injectivity, geometry, and integrability proofs are correct and complete.

Sections 2–4Correct and complete

The finite approximations retain the necessary word geometry

Pages 5–24 · Sections 2–4 · arXiv:2205.12137v3

The range estimates determine each diagonal-product element inside the selected quotient, cursor and lamp coordinates are preserved by the injection, and collisions are ruled out on the radii used by the coupling criterion. The distribution of ranges over the Følner sets gives a summable cocycle tail after composition with ρ1ε\rho^{1-\varepsilon}.

Diagonal-product constructionCorrect and complete

Local injectivity, expansion, and coupling integrability are verified on compatible scales

Sections 3–5 · arXiv:2205.12137v3

The scales are chosen so relations visible in one coordinate stabilize before the next factor is added. Bad vertices have summable density, expansion estimates survive the diagonal product, and shell-by-shell displacement bounds sum in the precise Orlicz/integrability class claimed.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2205.12137v3
Authors listed
Amandine Escalier
Audit date
August 18, 2026
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