arXiv:2606.15375v1

Numerical Integration at the Intersection of Probability Theory, Number Theory and Dynamical Systems

Zicheng Wang, Haisen Zhang, Xu Zhang

math.DSmath.NA65D3011K3837A44

Abstract

This paper is devoted to the study of uniformly distributed (u.d.) sequences on general non-compact topological spaces. Convergence-determining classes and the equivalent characterizations of u.d. sequences on T4T_4 spaces are discussed. For Polish spaces endowed with regular probability measures, the existence of a countable convergence-determining class for u.d. sequences is proved by virtue of the tightness of Borel probability measures. It is shown that, under the condition that a countable convergence-determining class exists, both independent identically distributed (i.i.d.) randomly sampled sequences and orbit sequences of ergodic transformations are u.d.\ with full measure.

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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
01Statements3 reported findingsCorrect

The Portmanteau-type characterization, construction of a countable convergence-determining class on a Polish probability space, and the probabilistic and ergodic uniformly distributed sequence corollaries are correct.

Theorem 3.1Correct

The numerical-integration criteria are equivalent to weak convergence

Section 3 · Portmanteau characterization · arXiv:2606.15375v1

Writing the empirical quadrature rule as a probability measure turns each criterion into a standard Portmanteau condition. The implications through bounded continuous functions, closed and open sets, and continuity sets preserve the quantifiers over the sample sequence and therefore give the claimed equivalence.

Theorem 4.1Correct

A countable convergence-determining family exists

Pages 11–13 · Section 4 · arXiv:2606.15375v1

Tight compact exhaustions and separability of continuous functions on each compact set produce a countable family. Tietze extension supplies bounded continuous tests on the whole space, while the indicators of the compact complements control both empirical and limiting mass outside the approximation region. The three-term estimate therefore determines every bounded continuous integral even when Cb(X)C_b(X) itself is nonseparable.

Corollaries 4.1 and 4.2Correct

Almost-sure uniformly distributed sample paths and orbits

Pages 13–15 · Section 4 · arXiv:2606.15375v1

For i.i.d. samples, the strong law holds separately for each member of the countable determining class, and intersecting those full-measure events remains a full-measure event. The same countable-intersection argument applied to Birkhoff's theorem gives uniform distribution along almost every orbit of any measure-preserving ergodic transformation. The auxiliary existence construction is used only under the section's nonatomic standard-probability hypothesis.

02Proofs1 reported findingCorrect

The weak-convergence reductions and the countable diagonal full-measure argument are complete and use only standard results whose hypotheses are verified.

Proof of Theorem 4.1Correct and complete

The compact exhaustion and extension argument determines all bounded continuous integrals

Section 4 · arXiv:2606.15375v1

Uniform approximation on each compact controls the integral there, while the explicitly included complement functions make the exterior mass uniformly small. Passing first along the determining family and then through the compact exhaustion proves convergence for every bounded continuous test function. The later use of a probability-preserving Borel model is valid for the stated nonatomic standard probability space.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2606.15375v1
Authors listed
Zicheng Wang, Haisen Zhang, Xu Zhang
Audit date
August 18, 2026
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