First Order Extensions of Classical Systems of Modal Logic: The Role of the Barcan Schemas

2018-06-29T23:18:19Z (GMT) by Horacio Arlo-Costa
The paper studies first order extensions of classical systems of modal logic (see (Chellas, 1980, part III)). We focus on the role of the Barcan formulas. It is shown that these formulas correspond to fundamental properties of neighborhood frames.