A functor is essentially surjective if for all , there merely exists an such that .
We say that is a weak equivalence if it is fully faithful and essentially surjective.
For categories there is no difference between weak equivalences and equivalences.
Category theory equivalence of precategories functor fully faithful functor
Revision on September 19, 2018 at 21:30:57 by Ali Caglayan. See the history of this page for a list of all contributions to it.