(a) If T: D is a covariant functor, let Im T consist of the objects {T(C)...
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(a) If T: ℓ →D is a covariant functor, let Im T consist of the objects {T(C) I C ϵ ℓ} and the morphisms {T(∫) : T(C) → T(C') I ∫: C → C' a morphism in ℓ}. Then show that Im T need not be a category.
(b) If the object function of T is injective, then show that Im T is a category.
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a To show that Im T need not be a category we need to find a counterexample Lets consider the following covariant functor T Set Set where Set is the c...View the full answer
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Related Book For
Algebra Graduate Texts In Mathematics 73
ISBN: 9780387905181
8th Edition
Authors: Thomas W. Hungerford
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