EntityQ2112502· pop 9· linked from 23 articlesprojective objectSign in to saveobject 𝑃 in an abelian category such that hom(𝑃,–) is an exact functor to the category of abelian groupsConnectionscategoryEntityInternational Standard Book NumberEntitysetEntitydigital object identifierEntityOCLC, Inc.EntityringEntityJSTOREntityabelian groupEntitysurjective functionEntitycategory theoryEntityaxiom of choiceEntityBanach spaceEntityimageEntitycompact spaceEntitynormed vector spaceEntityhomological algebraEntitycommutative diagramEntitySaunders Mac LaneEntityequivalence classEntitymorphismEntityCategoriesHarv and Sfn no-target errorsHomological algebraObjects (category theory)