arXiv:2402.02660v4

Stirling-Ramanujan constants are exponential periods

Vicente Muñoz, Ricardo Perez-Marco

math.NTmath-phmath.CAmath.CV40A0540G9911J8133B1511B68

Abstract

Ramanujan studied a general class of Stirling constants that are the resummation of some natural divergent series. These constants include the classical Euler-Mascheroni, Stirling and Glaisher-Kinkelin constants. We find natural integral representations for all these constants that appear as exponential periods in the field Q(t,et)\mathbb Q (t,e^{-t}) which reveals their natural transalgebraic nature. We conjecture that all these constants are transcendental numbers. Euler-Mascheroni's and Stirling's integral formula are classical, but the integral formula for Glaisher-Kinkelin appears to be new, as well as the integral formulas for the higher Stirling-Ramanujan constants. The method presented generalizes naturally to prove that many other constants are exponential periods over the field Q(t,et)\mathbb Q(t,e^{-t}).

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Audited against arXiv v4

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 15, 2026
01Statements3 reported findingsCorrect

The general integral formula for the Stirling–Ramanujan constants, its specializations through S3S_3, and the conclusion that these constants are exponential periods over Q(t,et)\mathbb Q(t,e^{-t}) are correct.

Theorem 2Correct

General exponential-period formula

Pages 5 and 10–14 · Theorem 2 and its derivation · arXiv:2402.02660v4

Summing the higher Frullani identity from 00 to s1s-1 separates the asymptotic expression into a polynomial without constant term, a family of higher Frullani integrals, a decaying Laplace transform, and a Faulhaber term. The Bernoulli-coefficient cancellation in the last term leaves exactly the displayed regularized integrand. Converting from log(s+1)\log(s+1) to logs\log s supplies the rational correction rnr_n, and Proposition 9 reduces it to the harmonic-number formula stated in the theorem.

Published article
Corollaries 3–4Correct

The cases S1S_1, S2S_2, and S3S_3

Pages 6 and 14–15 · Corollaries 3–4 and Section 5 · arXiv:2402.02660v4

Substitution of b1=1b_{-1}=1, b0=1/2b_0=1/2, b1=1/12b_1=1/12, b2=0b_2=0, b3=1/720b_3=-1/720 into Proposition 9 gives r1=1/4r_1=-1/4, r2=1/72r_2=1/72, and r3=1/288r_3=1/288. The resulting four integrals reproduce the printed numerical values S00.9189385332S_0\approx0.9189385332, S10.248754477S_1\approx0.248754477, S20.03044846S_2\approx0.03044846, and S30.02065635S_3\approx-0.02065635; the version-4 value of S3S_3 is consistent with the integral.

Full paper, version 4
Exponential-period conclusionCorrect

Membership in the stated period class

Pages 5–7 · discussion following Theorem 2 · arXiv:2402.02660v4

For every fixed nn, the integrand in Theorem 2 is a rational expression in tt and ete^{-t} with rational coefficients. Its apparent singularity at zero is removed by subtracting the Bernoulli jet and the rational rnr_n term, while the factor ete^{-t} gives convergence at infinity. The constants therefore satisfy the paper's explicit definition of exponential periods over Q(t,et)\mathbb Q(t,e^{-t}).

Full paper, version 4
02Proofs3 reported findingsCorrect

The proof is correct and complete. The higher Frullani identity, Laplace asymptotics, Faulhaber expansion, and harmonic-number simplification have matching indices and signs, and the endpoint convergence required by every displayed integral is established by the cancellations.

Theorem 7Correct and complete

Higher Frullani identity

Pages 8–9 · Theorem 7 · arXiv:2402.02660v4

For n=0n=0 the formula reduces to the classical Frullani integral for log(s+1)\log(s+1). Repeated integration in ss produces the polynomial with coefficients (nk)(HnHnk)\binom nk(H_n-H_{n-k}) and the regularized exponential integral shown. The cited source proves this identity with the same normalization, including the etdt/te^{-t}dt/t measure used downstream.

Barsky–Muñoz–Perez-Marco, On the genesis of BBP formulas
Proposition 8Correct and complete

Laplace-transform remainder estimate

Page 10 · Proposition 8 · arXiv:2402.02660v4

A bounded derivative gives at most linear growth of the function, so the boundary term at infinity vanishes. Repeated integration by parts yields Lf(s)=f(0)/s+f(0)/s2++f(m1)(0)/sm+O(sm1)L f(s)=f(0)/s+f'(0)/s^2+\cdots+f^{(m-1)}(0)/s^m+O(s^{-m-1}) under the printed bounded-derivative hypotheses. This justifies discarding integral (3) when extracting the constant term.

Full paper, version 4
Propositions 9–11Correct and complete

Bernoulli and harmonic-number bookkeeping

Pages 12–14 and 17 · Propositions 9–11 · arXiv:2402.02660v4

The two expansions of (1est)/(1et)(1-e^{-st})/(1-e^{-t}) give the stated Faulhaber polynomial. Reindexing the finite double sum leaves h=1,,n1h=-1,\ldots,n-1, and the binomial identity j=1m(1)j(mj)/j=Hm\sum_{j=1}^m(-1)^j\binom mj/j=-H_m produces Proposition 9 with the printed sign. Direct substitution for n=0,1,2,3n=0,1,2,3 confirms all rational corrections used in Section 5.

Full paper, version 4
03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2402.02660v4
Authors listed
Vicente Muñoz, Ricardo Perez-Marco
Audit date
August 15, 2026
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