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searching for Projective object 2 found (13 total)

Category of sets (1,168 words) [view diff] exact match in snippet view article find links to article

Every non-empty set is an injective object in Set. Every set is a projective object in Set (assuming the axiom of choice). The finitely presentable objects

Derived functor (3,050 words) [view diff] exact match in snippet view article find links to article

every object A of A there exists an epimorphism P → A where P is a projective object), then one can define analogously the left-derived functors LiG. For