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artie2000 committed Jan 3, 2025
1 parent f9a0c38 commit 7aa7fb9
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Showing 4 changed files with 5 additions and 5 deletions.
2 changes: 1 addition & 1 deletion Mathlib/AlgebraicGeometry/Cover/Open.lean
Original file line number Diff line number Diff line change
Expand Up @@ -210,7 +210,7 @@ lemma OpenCover.ext_elem {X : Scheme.{u}} {U : X.Opens} (f g : Γ(X, U)) (𝒰 :
fapply TopCat.Sheaf.eq_of_locally_eq' X.sheaf
(fun i ↦ (𝒰.map (𝒰.f i)).opensRange ⊓ U) _ (fun _ ↦ homOfLE inf_le_right)
· intro x hx
simp only [Opens.iSup_mk, Opens.carrier_eq_coe, Opens.coe_inf, Hom.opensRange_coe, Opens.coe_mk,
simp only [Opens.iSup_mk, Opens.carrier_eq_coe, Opens.coe_inf, Hom.coe_opensRange, Opens.coe_mk,
Set.mem_iUnion, Set.mem_inter_iff, Set.mem_range, SetLike.mem_coe, exists_and_right]
refine ⟨?_, hx⟩
simpa using ⟨_, 𝒰.covers x⟩
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4 changes: 2 additions & 2 deletions Mathlib/AlgebraicGeometry/Morphisms/Separated.lean
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Expand Up @@ -126,7 +126,7 @@ lemma Scheme.Pullback.diagonalCoverDiagonalRange_eq_top_of_injective
rw [← top_le_iff]
rintro x -
simp only [diagonalCoverDiagonalRange, openCoverOfBase_J, openCoverOfBase_obj,
openCoverOfLeftRight_J, Opens.iSup_mk, Opens.carrier_eq_coe, Hom.opensRange_coe, Opens.coe_mk,
openCoverOfLeftRight_J, Opens.iSup_mk, Opens.carrier_eq_coe, Hom.coe_opensRange, Opens.coe_mk,
Set.mem_iUnion, Set.mem_range, Sigma.exists]
have H : (pullback.fst f f).base x = (pullback.snd f f).base x :=
hf (by rw [← Scheme.comp_base_apply, ← Scheme.comp_base_apply, pullback.condition])
Expand All @@ -147,7 +147,7 @@ lemma Scheme.Pullback.range_diagonal_subset_diagonalCoverDiagonalRange :
Set.range (pullback.diagonal f).base ⊆ diagonalCoverDiagonalRange f 𝒰 𝒱 := by
rintro _ ⟨x, rfl⟩
simp only [diagonalCoverDiagonalRange, openCoverOfBase_J, openCoverOfBase_obj,
openCoverOfLeftRight_J, Opens.iSup_mk, Opens.carrier_eq_coe, Hom.opensRange_coe, Opens.coe_mk,
openCoverOfLeftRight_J, Opens.iSup_mk, Opens.carrier_eq_coe, Hom.coe_opensRange, Opens.coe_mk,
Set.mem_iUnion, Set.mem_range, Sigma.exists]
let i := 𝒰.f (f.base x)
obtain ⟨y : 𝒰.obj i, hy : (𝒰.map i).base y = f.base x⟩ := 𝒰.covers (f.base x)
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2 changes: 1 addition & 1 deletion Mathlib/AlgebraicGeometry/Noetherian.lean
Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,7 @@ lemma isLocallyNoetherian_of_isOpenImmersion {Y : Scheme} (f : X ⟶ Y) [IsOpenI
· suffices Scheme.Hom.opensRange f ⊓ V = V by
rw [this]
rw [← Opens.coe_inj]
rw [Opens.coe_inf, Scheme.Hom.opensRange_coe, IsOpenMap.coe_functor_obj,
rw [Opens.coe_inf, Scheme.Hom.coe_opensRange, IsOpenMap.coe_functor_obj,
Set.inter_eq_right, Set.image_subset_iff, Set.preimage_range]
exact Set.subset_univ _

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2 changes: 1 addition & 1 deletion Mathlib/AlgebraicGeometry/OpenImmersion.lean
Original file line number Diff line number Diff line change
Expand Up @@ -543,7 +543,7 @@ theorem range_pullback_to_base_of_left :
Set.range f.base ∩ Set.range g.base := by
rw [pullback.condition, Scheme.comp_base, TopCat.coe_comp, Set.range_comp,
range_pullback_snd_of_left, Opens.carrier_eq_coe, Opens.map_obj, Opens.coe_mk,
Set.image_preimage_eq_inter_range, Opens.carrier_eq_coe, Scheme.Hom.opensRange_coe]
Set.image_preimage_eq_inter_range, Opens.carrier_eq_coe, Scheme.Hom.coe_opensRange]

theorem range_pullback_to_base_of_right :
Set.range (pullback.fst g f ≫ g).base =
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