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Mathlib.CategoryTheory.Preadditive.EilenbergMoore

Preadditive structure on algebras over a monad #

If C is a preadditive category and T is an additive monad on C then Algebra T is also preadditive. Dually, if U is an additive comonad on C then Coalgebra U is preadditive as well.

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theorem CategoryTheory.Monad.algebraPreadditive_homGroup_zsmul_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] (F : CategoryTheory.Monad.Algebra T) (G : CategoryTheory.Monad.Algebra T) (r : ℤ) (α : F ⟶ G) :
(r • α).f = r • α.f
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theorem CategoryTheory.Monad.algebraPreadditive_homGroup_sub_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] (F : CategoryTheory.Monad.Algebra T) (G : CategoryTheory.Monad.Algebra T) (α : F ⟶ G) (β : F ⟶ G) :
(α - β).f = α.f - β.f
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theorem CategoryTheory.Monad.algebraPreadditive_homGroup_neg_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] (F : CategoryTheory.Monad.Algebra T) (G : CategoryTheory.Monad.Algebra T) (α : F ⟶ G) :
(-α).f = -α.f
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theorem CategoryTheory.Monad.algebraPreadditive_homGroup_add_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] (F : CategoryTheory.Monad.Algebra T) (G : CategoryTheory.Monad.Algebra T) (α : F ⟶ G) (β : F ⟶ G) :
(α + β).f = α.f + β.f
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theorem CategoryTheory.Monad.algebraPreadditive_homGroup_zero_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] (F : CategoryTheory.Monad.Algebra T) (G : CategoryTheory.Monad.Algebra T) :
0.f = 0
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theorem CategoryTheory.Monad.algebraPreadditive_homGroup_nsmul_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] (F : CategoryTheory.Monad.Algebra T) (G : CategoryTheory.Monad.Algebra T) (n : ℕ) (α : F ⟶ G) :
(n • α).f = n • α.f
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instance CategoryTheory.Monad.algebraPreadditive (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] :
CategoryTheory.Preadditive (CategoryTheory.Monad.Algebra T)

The category of algebras over an additive monad on a preadditive category is preadditive.

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instance CategoryTheory.Monad.forget_additive (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (T : CategoryTheory.Monad C) [CategoryTheory.Functor.Additive T.toFunctor] :
CategoryTheory.Functor.Additive (CategoryTheory.Monad.forget T)
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theorem CategoryTheory.Comonad.coalgebraPreadditive_homGroup_neg_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] (F : CategoryTheory.Comonad.Coalgebra U) (G : CategoryTheory.Comonad.Coalgebra U) (α : F ⟶ G) :
(-α).f = -α.f
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theorem CategoryTheory.Comonad.coalgebraPreadditive_homGroup_zsmul_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] (F : CategoryTheory.Comonad.Coalgebra U) (G : CategoryTheory.Comonad.Coalgebra U) (r : ℤ) (α : F ⟶ G) :
(r • α).f = r • α.f
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theorem CategoryTheory.Comonad.coalgebraPreadditive_homGroup_sub_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] (F : CategoryTheory.Comonad.Coalgebra U) (G : CategoryTheory.Comonad.Coalgebra U) (α : F ⟶ G) (β : F ⟶ G) :
(α - β).f = α.f - β.f
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theorem CategoryTheory.Comonad.coalgebraPreadditive_homGroup_nsmul_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] (F : CategoryTheory.Comonad.Coalgebra U) (G : CategoryTheory.Comonad.Coalgebra U) (n : ℕ) (α : F ⟶ G) :
(n • α).f = n • α.f
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theorem CategoryTheory.Comonad.coalgebraPreadditive_homGroup_add_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] (F : CategoryTheory.Comonad.Coalgebra U) (G : CategoryTheory.Comonad.Coalgebra U) (α : F ⟶ G) (β : F ⟶ G) :
(α + β).f = α.f + β.f
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theorem CategoryTheory.Comonad.coalgebraPreadditive_homGroup_zero_f (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] (F : CategoryTheory.Comonad.Coalgebra U) (G : CategoryTheory.Comonad.Coalgebra U) :
0.f = 0
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instance CategoryTheory.Comonad.coalgebraPreadditive (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] :
CategoryTheory.Preadditive (CategoryTheory.Comonad.Coalgebra U)

The category of coalgebras over an additive comonad on a preadditive category is preadditive.

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instance CategoryTheory.Comonad.forget_additive (C : Type u₁) [CategoryTheory.Category.{v₁, u₁} C] [CategoryTheory.Preadditive C] (U : CategoryTheory.Comonad C) [CategoryTheory.Functor.Additive U.toFunctor] :
CategoryTheory.Functor.Additive (CategoryTheory.Comonad.forget U)
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