Short··0:20·Number theory

Milne's Rationality Conjecture: OpenAI Claims a Proof

Short · 0:20 · 12 October 2026Watch on YouTube →

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About this video

Milne's rationality conjecture says that when an abelian variety is reduced mod p, pairing a Hodge class with products of divisors gives one and the same rational number in every cohomology theory. The animation shows the classical case with divisors: on the curve y² = x³ + 2, the 9 points with −2x = x appear both on the complex torus and among the 117 points mod 103. OpenAI claims a proof of the conjecture for abelian varieties with good reduction, including residue characteristic 2; this is OpenAI's preprint, not yet peer reviewed.

Papers (OpenAI, catalogue result 001):
- Milne's rationality conjecture for abelian varieties: github.com/openai/math/blob/main/preprints/Milnes-rationality…

The animation illustrates the result; it is not a proof.

Gradient Damage: mathematics you can see, equations you can hear.
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Every result explained: gradientdamage.com/p/001

About the problem

Number theory·OpenAI Math·Result 001

Milne’s rationality conjecture and algebraic specialization

Proves Milne's rationality conjecture for abelian varieties over ℚ̅ with good reduction: specialized Hodge classes pair rationally with complementary divisor products, independently of cohomology theory. Together with result 032, every specialized Hodge class is represented by a single rational algebraic cycle simultaneously in all prime-to-p and crystalline realizations, for every residue characteristic p.

OpenAI, in its public catalogue of maths results · preprint, not peer reviewed

The papers and the claim →

Topics

Milne rationality conjectureMilne's conjectureJames MilneHodge classesHodge conjectureabelian varietieselliptic curvesgood reductionfinite fieldscrystalline cohomologyetale cohomologyalgebraic cyclesTate conjecturearithmetic geometrynumber theoryOpenAIOpenAI mathAI mathematicsAI proofmathsmathematicsmath shorts3D animation