Duality and pseudo duality of dual disjunctive normal forms

The paper introduces the concepts of dual disjunctive normal forms in classical logic and fuzzy logics with involution negation. The laws of their truth values are studied. One is called duality, the other is called pseudo duality. Dual disjunctive normal forms in classical logic hold duality, and dual disjunctive normal forms in fuzzy logics with involution negation hold either duality or pseudo duality.