Question
Prove that every object in Sets is projective and injective.
Step 1
Recall the definitions of projective and injective objects in a category. An object P in a category C is called projective if for every epimorphism f: A -> B and every morphism g: P -> B, there exists a morphism h: P -> A such that f ∘ h = g. An object I in a Show more…
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