Explicit Constructive Logic

One of the main goals of Explicit Constructive Logic (ECL) is to provide a constructive formulation of Full (Classical) Higher Order Logic LK ω that can be seen as a foundation for knowledge representation. ECL is introduced as a subsystem Z ω of LK ω . The first order case Z 1 and the propositional case Z 0 of ECL are examined as well. A comparison of constructivism from the point of view of ECL and of the corresponding features of Intuitionistic Logic, and Constructive Paraconsistent Logic is proposed.