Theorems · Theorem · category theory
TopCat.Presheaf.isSheaf_iff_isSheafPairwiseIntersections
∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] {X : TopCat} (F : TopCat.Presheaf C X),
F.IsSheaf ↔ F.IsSheafPairwiseIntersectionsThe sheaf condition in terms of an equalizer diagram is equivalent
to the reformulation in terms of a limit diagram over U i and U i ⊓ U j.
- Cited by
- 4 results in Mathlib
- Foundations
- Depth 84 from the axioms · uses propext, Classical.choice, Quot.sound
- Assumes
- CategoryTheory.Category
Around this declaration
Dashed lines are statement dependencies; solid lines are citations in proofs.
Cites7
Mathlib declarations this one mentions in its statement or cites explicitly in its proof. Plumbing is filtered out.
- CategoryTheory.Categorystatement and proof · cited by 32,673
- TopCatstatement and proof · cited by 1,889
- TopCat.Presheafstatement and proof · cited by 371
- TopCat.Presheaf.IsSheafstatement · cited by 38
- TopCat.Presheaf.IsSheafPairwiseIntersectionsstatement and proof · cited by 3
- TopCat.Presheaf.isSheaf_iff_isSheafOpensLeCoverproof · cited by 2
- TopCat.Presheaf.isSheafOpensLeCover_iff_isSheafPairwiseIntersectionsproof · cited by 1
Cited by4
Results whose statement or proof uses this declaration.
- TopCat.Sheaf.interUnionPullbackConeLift_leftproof · cited by 0
- TopCat.Sheaf.interUnionPullbackConeLift_rightproof · cited by 0
- TopCat.Presheaf.isSheaf_iff_isSheafEqualizerProductsproof · cited by 0
- TopCat.Presheaf.isSheaf_iff_isSheafPreservesLimitPairwiseIntersectionsproof · cited by 0