Theorems · Definition · category theory

CategoryTheory.Limits.biprod.uniqueUpToIso

{C : Type uC} →
  [inst : CategoryTheory.Category.{uC', uC} C] →
    [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C] →
      (X Y : C) →
        [inst_2 : CategoryTheory.Limits.HasBinaryBiproduct X Y] →
          {b : CategoryTheory.Limits.BinaryBicone X Y} → b.IsBilimit → (b.pt ≅ X ⊞ Y)

Binary biproducts are unique up to isomorphism. This already follows because bilimits are limits, but in the case of biproducts we can give an isomorphism with particularly nice definitional properties, namely that biprod.lift b.fst b.snd and biprod.desc b.inl b.inr are inverses of each other.

Defined in

Mathlib.CategoryTheory.Limits.Shapes.BinaryBiproducts

Cited by

3 results in Mathlib

Foundations

Depth 35 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

CategoryTheory.CategoryCategoryTheory.Limits.HasZeroMorphismsCategoryTheory.Limits.HasBinaryBiproduct