Han and Jiang's Question on klt Type in Flat Families
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Statement
Han and Jiang asked whether being of klt type is an open condition in flat families of varieties. It is not.
Context
A clean openness question in birational geometry, answered negatively by explicit counterexample.
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The division of labour is stated precisely, which is rare: ChatGPT Pro 5.5 suggested the general idea for the counterexample, and the Rethlas system found the explicit example and proved it. The author describes the construction as substantially using generative AI.
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