Implication details
Claim: If a category is coextensive and has coquotients of cocongruences and is coregular, then it has effective congruences.
Proof: This follows from the dual implication.
This implication has a dual.
Claim: If a category is coextensive and has coquotients of cocongruences and is coregular, then it has effective congruences.
This implication has a dual.