5 relations: Abelian category, Delta-functor, Grothendieck's Tôhoku paper, Monomorphism, Preadditive category.

## Abelian category

In mathematics, an abelian category is a category in which morphisms and objects can be added and in which kernels and cokernels exist and have desirable properties.

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## Delta-functor

In homological algebra, a δ-functor between two abelian categories A and B is a collection of functors from A to B together with a collection of morphisms that satisfy properties generalising those of derived functors.

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## Grothendieck's Tôhoku paper

The article Sur quelques points d'algèbre homologique by Alexander Grothendieck, now often referred to as the Tôhoku paper, was published in 1957 in the Tôhoku Mathematical Journal.

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## Monomorphism

In the context of abstract algebra or universal algebra, a monomorphism is an injective homomorphism.

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## Preadditive category

In mathematics, specifically in category theory, a preadditive category is a category that is enriched over the monoidal category of abelian groups.

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