Defeasible Logic: Reasoning, Common Sense, Non Monotonic Logic, Default Logic

Default Logic: Non Monotonic Logic, Raymond Reiter, Closed World Assumption

Preferential Entailment: Non Monotonic Logic, Model (logic), Entailment

Belief Revision: Intelligent Agent, Artificial intelligence, Knowledge representation, Non monotonic logic, Defeasible...

Non Monotonic Extensions of Logic Programming