arXiv:2110.02569v4

On the transcendence of special values of Goss LL-functions attached to Drinfeld modules

Oğuz Gezmiş, Changningphaabi Namoijam

math.NT11G0911M3811J93

Abstract

Let Fq\mathbb{F}_q be the finite field with qq elements and consider the rational function field K:=Fq(θ)K:=\mathbb{F}_q(θ). For a Drinfeld module φφ defined over KK, we study the transcendence of special values of the Goss LL-function attached to the abelian tt-motive MφM_φ of φφ. Moreover, when φφ is a Drinfeld module of rank r2r\geq 2 defined over KK which has everywhere good reduction, we prove that the value of the Goss LL-function attached to the (r1)(r-1)-st exterior power of MφM_φ at any positive integer is transcendental over KK.

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Audited against arXiv v4

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Generated August 15, 2026
01Statements2 reported findingsCorrect

Both transcendence assertions in Theorem 1.1 are supported: the special values attached to an arbitrary Drinfeld module, and those attached to the (r1)(r-1)-st exterior power under everywhere good reduction, are reduced to nonzero Taelman regulators whose relevant logarithmic coordinates are algebraically independent.

Theorem 1.1(i)Correct

Transcendence for the Goss value attached to MϕM_\phi

Page 3 and pages 17–20 · Theorem 1.1(i), equations (34)–(35), and Theorem 3.4 · arXiv:2110.02569v4

At every good finite place, the dual local factor of the constructed module En,AE_{n,A} equals the local factor of MϕM_\phi with the required Carlitz shift. The finitely many bad factors contribute only a nonzero element of KK. Fang's class formula and Theorem 4.1 express the resulting Taelman value as a nonzero algebraic factor times a determinant of tractable logarithm coordinates. A maximal subset independent over the endomorphism fraction field satisfies the hypotheses of the cited algebraic-independence theorem, so the nonzero determinant is transcendental. The rank-one case is separately reduced to a Carlitz tensor power and Yu's theorem.

Theorem 1.1(ii)Correct

Transcendence for the exterior-power value

Page 3 and pages 18–20 · Theorem 1.1(ii), equation (36), and Theorem 3.5 · arXiv:2110.02569v4

Everywhere good reduction permits normalization to a Drinfeld module over AA with constant leading coefficient. Equation (36) identifies the exterior-power Goss value with the Taelman value of Gn,AG_{n,A}. The regulator determinant uses exactly the bottom rr tractable coordinates, and the nonzero determinant is a nonconstant polynomial in a maximal family of logarithms independent over the endomorphism field. The applicable algebraic-independence theorem therefore makes the value transcendental.

02Proofs2 reported findingsCorrect

The local-factor comparison, good-reduction normalization, Taelman class formula, regulator determinant, and algebraic-independence inputs are applied with matching hypotheses. No substantive proof gap or formal mismatch was found in the exact revised version.

Equations (28)–(36)Correct and complete

Local factors and Taelman values are matched correctly

Pages 15–18 · Sections 3.3–3.4 · arXiv:2110.02569v4

The characteristic polynomials at good primes are related by the stated duality and Carlitz twist, and the finite set of bad Euler factors is absorbed into a nonzero element of KK. The cardinality quotients defining the Taelman Euler factors agree with those dual polynomials at 11, giving equations (35) and (36) with the correct shift from n+1n+1 to the nonnegative tensor index nn.

Theorem 4.1 and proofs of Theorems 3.4–3.5Correct and complete

The regulator-to-transcendence step is complete

Pages 18–20 · Theorem 4.1 and proofs of Theorems 3.4–3.5 · arXiv:2110.02569v4

The cited class-number and unit-module results give a full-rank free regulator lattice. The nilpotent part of the differential identifies its exterior generator with the determinant of the displayed tractable-coordinate matrix. Nonvanishing of the Taelman value makes that determinant nonzero. The external algebraic-independence results apply because the chosen logarithms exponentiate to algebraic points and are independent over the appropriate endomorphism fraction field; their stated coordinate sets coincide with those appearing in the two determinants.

Algebraic-independence input, arXiv:2407.18916v2
03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2110.02569v4
Authors listed
Oğuz Gezmiş, Changningphaabi Namoijam
Audit date
August 15, 2026
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