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Kobayashi’s canonical-ampleness conjecture

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Every compact connected Kähler manifold of positive complex dimension with no nonconstant entire curve has ample canonical bundle and is therefore projective. This proves Kobayashi’s canonical-ampleness conjecture in the smooth compact Kähler setting.

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The paper states

Theorem 1.1

In Canonical ampleness of compact hyperbolic Kähler manifolds, 23 September 2026

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Let X be a compact connected Kähler manifold of positive complex dimension. If every holomorphic map \C\to X is constant, then K_X is ample. In particular, a positive tensor power of K_X defines a holomorphic embedding of X into a complex projective space.

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Papers

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Canonical ampleness of compact hyperbolic Kähler manifolds

23 September 2026, current edition.

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We prove that every compact connected Kähler manifold of positive complex dimension containing no nonconstant entire curve has ample canonical bundle and is projective. This resolves positively Kobayashi’s canonical-ampleness conjecture in the smooth compact Kähler category.

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  • An unsigned public tier list, the OpenAI Math Tier List, classes it as a proof and rates its significance, if it holds up, as “Major math journal”. The page says that nothing on it is verified.

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