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Algebraic and complex geometry

Algebraic and complex geometry

Official catalogue 032–069.

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Catalogues in this field

Official catalogue numbers
033

Campana's orbifold Iitaka conjecture and logarithmic subadditivity

Read the results and proof connections of five manuscripts on subadditivity, whole-fiber variation, additivity, and semiampleness.

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Proof overviews (5)Official catalogue order
  1. Orbifold and logarithmic Iitaka subadditivity
  2. Logarithmic Kodaira dimension and whole-fiber variation
  3. The reverse logarithmic Kodaira inequality and additivity
  4. Projective Hodge lines and ordinary Iitaka subadditivity
  5. B-semiampleness for compact log-smooth Kähler fibrations
034

Log abundance and effective Iitaka fibrations

A guide to manuscripts on abundance and good minimal models, organized by hypotheses, conclusions, and arguments.

All 14 overviews available

The catalogue synthesis connects the results, proof strategies, and theorems used across these manuscripts.

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Proof overviews (14)Official catalogue order
  1. Log abundance for compact Kähler spaces under logarithmic Iitaka subadditivity
  2. Uniform indices for semi-log-canonical log Calabi–Yau pairs
  3. Conditional good minimal models for compact Kähler fourfolds
  4. Log abundance in characteristic zero
  5. Minimal metrics and interior injectivity for nef adjoints
  6. Fourfold nonvanishing by minimal metrics and moving jets
  7. Lifting sections from the reduced support of an adjoint
  8. Schnell fiber spaces and good canonical models
  9. Uniform log Iitaka fibrations and bounded moduli denominators
  10. Uniform Pluricanonical Iitaka Fibrations
  11. Relative denominators and effective systems for log Calabi-Yau fibrations
  12. Arithmetic Stein-degree bounds for log Calabi–Yau pairs
  13. Uniform effective log Iitaka fibrations for fourfolds
  14. Abundance after nonvanishing for compact Kähler fourfolds
036

Numerical semiampleness and generalized minimal models

Follow four proofs of models with fixed nef data, projective and Kähler numerical semiampleness, and minimal models in numerical dimension one.

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The catalogue synthesis connects the results, proof strategies, and theorems used across these manuscripts.

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Proof overviews (4)Official catalogue order
  1. Numerical semiampleness of nef adjoint classes on compact Kähler manifolds
  2. Numerical Semiampleness of Nef Adjoint Divisors
  3. Minimal models and Mori fibre spaces for generalized log canonical Q-pairs
  4. Minimal models in numerical dimension one
037

The sharp ordinary-double-point volume gap

Follow two proofs from the fourfold hypersurface reduction to the volume gap and equality classification in every dimension, with global consequences.

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Proof overviews (2)Official catalogue order
  1. The ordinary-double-point gap in every dimension
  2. The normalized-volume gap in dimension four
039

Nagata’s conjecture and maximal Seshadri constants

Follow four proofs of the strict plane Nagata inequality and maximal multipoint Seshadri constants on surfaces, in higher dimensions, and in positive characteristic.

All 4 overviews available

The catalogue synthesis connects the results, proof strategies, and theorems used across these manuscripts.

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Proof overviews (4)Official catalogue order
  1. Nagata's conjecture for plane curves
  2. Maximal Seshadri constants on arbitrary polarized surfaces
  3. Maximal Multipoint Seshadri Constants in Higher Dimensions
  4. Maximal multipoint Seshadri constants in positive characteristic
046

Counterexamples to Shafarevich holomorphic convexity

Follow two constructions of projective varieties whose universal covers fail holomorphic convexity: a fourfold with large fundamental group and a surface with chains of rational curves.

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The catalogue synthesis connects the results, proof strategies, and theorems used across these manuscripts.

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Proof overviews (2)Official catalogue order
  1. A projective fourfold with large fundamental group and non-Stein universal cover
  2. A surface counterexample to Shafarevich holomorphic convexity
052

Tangent-bundle splittings and universal covers

Follow two proofs separating integrability of a prescribed tangent splitting from product decompositions of the universal cover or the manifold itself.

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The catalogue synthesis connects the results, proof strategies, and theorems used across these manuscripts.

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Proof overviews (2)Official catalogue order
  1. Universal-cover splitting for compact Kähler manifolds
  2. Integrability of split tangent bundles on rationally connected manifolds
057

Campana's abelianity conjecture and special varieties

Follow three proofs linking ordinary fundamental groups of special varieties, linear images for open varieties, and the passage to root orbifolds.

All 3 overviews available

The catalogue synthesis connects the results, proof strategies, and theorems used across these manuscripts.

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Proof overviews (3)Official catalogue order
  1. The abelianity conjecture for special compact Kähler manifolds
  2. Two-step monodromy of special quasi-projective varieties
  3. A conditional abelianity theorem for special fourfold pairs with a half-weight divisor
068

Anticanonical nonvanishing under smooth semipositivity

Follow seven proofs connecting anticanonical nonvanishing with invariant indices, metric descent, and invariant sections.

All 7 overviews available

The catalogue synthesis connects the results, proof strategies, and theorems used across these manuscripts.

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Proof overviews (7)Official catalogue order
  1. Anticanonical nonvanishing from smooth semipositivity
  2. Invariant anticanonical indices and conversion of twisted differentials
  3. Bounded anticanonical metrics on klt pairs and torus quotients
  4. Cohomological transfer and equivariant anticanonical sections
  5. Metric descent and rank-preserving contractions
  6. Integrable metrics and effectivity with controlled boundary
  7. Exact orders and invariant anticanonical linear systems

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