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A conditional abelianity theorem for special fourfold pairs with a half-weight divisor

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OpenAI Mathopenai-math/A-conditional-abelianity-theorem-for-special-fourfold-pairs-with-a-half-weight-divisorOct 5, 2026math.AGAI-generatedscore 0

Using the abelianity theorem for special compact Kähler manifolds in every dimension, we prove virtual abelianity of the entire orbifold fundamental group of the special order-two root orbifold associated with a pair $(X,\tfrac12D)$, where X is a smooth projective fourfold and D is a nonempty smooth connected divisor. We construct a special smooth projective eightfold whose fundamental group surjects onto the required group.

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