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"The image of a category by under a functor is a category."

It

This is a small one, but it lasted for six months when I was starting in category theory.

A counter example exists in finite case ( counterexample exists, with just 3 objectsonly) , . Even under a connectivity requirement, a small finite counter example exist as wellcounterexample still exists. In fact, it is dead wrong to thing think anything like thatthis holds.

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"The image of a category by a functor is a category."

It is a small one but it lasted for six months when starting in category theory.

A counter example exists in finite case ( 3 objects only) , under a connectivity requirement a small finite counter example exist as well. In fact it is dead wrong to thing like that.