Abstract

Romik has presented a construction of a 1-dimensional dynamical system on the unit interval by developing an algorithm that returns the unique sequence of matrices associated with a positive primitive Pythagorean triple (in the sense of Barning), and projecting the map involved in this algorithm onto an appropriate 1-dimensional space via stereographic projection. Romik additionally computes the infinite, absolutely continuous invariant measure, and shows that the system is conservative and ergodic. Later, Cha et al. provided a method of calculating "Berggren trees", which are generalisations of the tree of positive primitive Pythagorean triples one may construct via Barning's theorem, except for different homogeneous quadratic equations in 3 variables. We present here a method of computing 1-dimensional dynamical systems induced from these Berggren trees following Romik's outline, and determine their absolutely continuous invariant measures by adapting the method of Keane.

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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.

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Detailed mathematical audit

Generated August 18, 2026
01Statements2 reported findingsCorrect

The tree parametrizations of integer zeros of the ternary quadratic forms and the invariant, conservative, ergodic measure descriptions for the associated maps are correct.

Theorems 1.2–1.6Correct

The Berggren-type dynamics enumerate the primitive solutions

Pages 2–6 and Sections 2–6 · arXiv:2607.03354v1

The displayed integer matrices preserve the relevant quadratic form and positivity cone, and the inverse branch is uniquely determined away from the root, which gives a disjoint rooted tree of primitive solutions. Projectivization produces the stated interval maps. Their invariant densities satisfy the branchwise Perron–Frobenius identities, while inducing on the finite-measure core gives recurrence and ergodicity and transfers these properties back to the original sigma-finite systems.

Full paper, version 1
Theorems 1.2–1.6 and Theorem 4.2Correct

Arithmetic generation and the projective dynamical systems agree

Pages 3–11 and Section 4 · arXiv:2607.03354v1

Each generator preserves its quadratic form and its projectivization is the corresponding Möbius branch. The inverse branches strictly reduce height on disjoint cones, which gives exhaustive nonduplicating generation, while the branch Jacobians yield the announced invariant densities.

02Proofs2 reported findingsCorrect

The algebraic enumeration and the invariant-measure and inducing proofs are correct and complete.

Sections 2–6Correct and complete

Branch uniqueness, invariance, and inducing are verified on all pieces

Pages 6–20 · Sections 2–6 · arXiv:2607.03354v1

Matrix identities verify preservation of the forms, congruence and sign arguments give primitivity and a unique predecessor, and boundary points are treated separately. The Jacobian calculations agree with the stated densities on each branch. The induced maps have finite invariant measure and bounded distortion, so standard exactness and conservativity results apply with their hypotheses met.

Sections 2–6Correct and complete

Descent, branch separation, and inducing complete the two proof chains

Pages 12–37 · arXiv:2607.03354v1

Direct multiplication verifies form preservation and primitivity; cone inequalities select a unique inverse generator and force termination at a root. For the dynamical conclusions, the transfer identity holds branchwise, and inducing removes neutral behavior so the cited expanding Markov criteria give conservativity, exactness, and ergodicity.

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No non-novelty findings.

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Paper
arXiv:2607.03354v1
Authors listed
Alden Paige
Audit date
August 18, 2026
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