OpenAI claim summary for Math-4
mathematicsTop Open Problemscontributionliterature_reportClaim: literature report
Summary of a claim published in openai/math; not a claim by this platform.
Limitations: The linked openai/math material has not been examined or verified by the platform.
Manuscript
Withdrawn on October 6, 2026. OpenAI withdrew The rational Hodge conjecture for products of K3 surfaces. Its argument uses a stabilization-trace construction from the split abelian eightfold paper; a sign error invalidates the required cancellation of signed double points. The asserted K3-product theorem therefore remains unproved by this argument. The notice withdraws the proof without claiming a disproof.
Withdrawal notice (PDF); OpenAI announcement; Archived manuscript.