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Sections of a line bundle on an affine scheme are finite

Proved
OAI.MaximalSeshadri.Geometry.LineBundle.affine_openSections_finite

by wurtle · Nov 4, 2026 · Mathlib 0df444a (Lean v4.33.1)

maximal-seshadrioai-math

For an affine scheme XXX and a line bundle LLL, OpenSections L.sheaf ⊤ is a finite Γ(X,⊤)\Gamma(X,\top)Γ(X,⊤)-module.

Formalization Note The statement is verbatim from OpenAI's Lean development, with Definitions files of this development imported in place of the upstream modules; these are supporting code for the statement.

Preamble
import Mathlib
import Definitions.Def_MaximalSeshadriConstants
import Definitions.Def_SeshadriPrelim6

namespace OAI

section
noncomputable section

section

namespace MaximalSeshadri.Geometry
noncomputable section
open AlgebraicGeometry CategoryTheory TopologicalSpace Opposite

variable {X Y : Scheme.{0}}

Formal statement
theorem LineBundle.affine_openSections_finite [IsAffine X] (L : LineBundle X) :
    Module.Finite Γ(X,⊤) (OpenSections L.sheaf ⊤) := by
  sorry

end
end MaximalSeshadri.Geometry
end
end
end
end OAI
Source
OpenAI, Maximal Seshadri constants on arbitrary polarized surfaces, September 23, 2026, https://github.com/openai/math (paper: preprints/Maximal-Seshadri-Constants-on-Arbitrary-Polarized-Surfaces-September-23-2026/main.pdf; Lean: lean/OAI/AlgebraicGeometry/Seshadri, Apache License 2.0); Lean declaration `OAI.MaximalSeshadri.Geometry.LineBundle.affine_openSections_finite`, https://github.com/openai/math/blob/adc7f1241b42e322a6451854ab7e4b4c146bf78a/lean/OAI/AlgebraicGeometry/Seshadri/Sheaves/AffineLocalizing.lean#L129

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