Boundedness of total Cartier indices for rational singularities in families

Published 21 May 2026 in math.AG | (2605.22782v1)

Abstract: We show that the total Cartier index of varieties with rational singularities in a bounded family is bounded. This solves a problem of Han and Jiang. The overall structure of the proof, which treats the surface case and the higher-dimensional case separately, was originated by generative AI, particularly the Rethlas system, and was substantially corrected and elaborated by hand.

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