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First Order Extensions of Classical Systems of Modal Logic: The Role of the Barcan Schemas
journal contribution
posted on 2001-04-29, 00:00 authored by Horacio Arlo-CostaThe 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.