arXiv:2603.05849v2

On indefinite integral ternary quadratic forms

Alexander Gamburd, Amit Ghosh, Peter Sarnak, Junho Peter Whang

math.NT11J0611E2037A45

Abstract

We resolve two problems pertaining to indefinite integral ternary quadratic forms, one highlighted by Margulis and the other initiated by Serre, both from 1990. To do so we develop tools for dealing with high ramification in problems involving sums over classes of such forms weighted by their diophantine invariants.

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Audited against arXiv v2

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 asymptotic MAR(X)γXlogX\operatorname{MAR}(X)\sim\gamma X\log X and the natural-density theorem for primitive isotropic ternary quadratic forms are supported. Several monomials and indices in the local-classification tables are visibly mistyped, but the surrounding diagonal-form pattern uniquely identifies their corrections and the Euler-factor calculation uses the corrected pattern.

Theorem 1.1Correct

Asymptotic count in the Markoff spectrum

Pages 2 and 9–38 · Parts 1 and proof in Section 7 · arXiv:2603.05849v2

Classes are organized into root packets and weighted by their local data. The pointwise packet asymptotic is dominated by the summable function 2ω3(r)log+r/r9/162^{\omega_3(r)}\log^+r/r^{9/16}, so dominated convergence legitimately interchanges the packet sum and the limit. The resulting series for γ\gamma is finite and positive, giving the stated XlogXX\log X asymptotic with multiplicity.

Theorem 1.3Correct

Natural density of primitive isotropic forms

Pages 3 and 39–52 · Parts 2, Sections 8–10 · arXiv:2603.05849v2

Eskin–Oh equidistribution reduces the localized real count to a weighted sum of Siegel masses. The isotropic masses factor into the computed local densities, and the Dirichlet series has the square-root singularity that yields the X6/logXX^6/\sqrt{\log X} scale. The normalization is calibrated by the unrestricted Siegel mass formula. The final truncation near the discriminant-zero locus is controlled by the cited upper-bound sieve, so the localized cone asymptotic extends to the allowed domains Ω\Omega.

02Proofs2 reported findingsCorrect

The packet asymptotics, domination, homogeneous equidistribution, mass formula, and Euler-product calculation form complete proofs of the two main theorems. The local tables contain obvious variable-name typos, recorded below, that do not alter the classifications or subsequent sums.

Sections 7–10Correct and complete

Dominated packet sum and isotropic mass asymptotics

Pages 37–52 · arXiv:2603.05849v2

The dominating series is independent of XX and summable, the finitely many low-discriminant classes are negligible after normalization, and all masses are nonnegative. In the isotropic count, the unrestricted lattice-point asymptotic fixes the global Haar normalization before restriction to isotropic genera. The odd-prime and two-adic tables reproduce the Euler factors displayed in Theorem 10.1, whose factorization supplies the constant in Theorem 1.3.

Propositions 10.2 and 10.3Typo

Several diagonal monomials and one exponent use the wrong variable

Pages 47–49 · local classification tables · arXiv:2603.05849v2

In Proposition 10.2, entries such as pt3d0x33p^{t_3}d_0x_3^3 and repeated final x22x_2^2 terms occur in formulas explicitly presented as diagonal ternary quadratic forms; they must be pt3d0x32p^{t_3}d_0x_3^2 and final x32x_3^2 terms. In Proposition 10.3, the last two mass formulas for Vi+2vcx32V_i+2^v c x_3^2 print powers involving uu although only vv is defined in those cases. Replacing uu by vv restores the symmetric table. The composite sums and Euler-factor proof use these corrected degrees and indices, so the defects are typographical only.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2603.05849v2
Authors listed
Alexander Gamburd, Amit Ghosh, Peter Sarnak, Junho Peter Whang
Audit date
August 18, 2026
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