TY - JOUR AU - Pizzi, Claudio PY - 1999/10/31 Y2 - 2024/03/28 TI - Contingency logics and propositional quantification JF - Manuscrito: Revista Internacional de Filosofia JA - Manuscrito - Rev. Int. Fil. VL - 22 IS - 2 SE - Artigos DO - UR - https://periodicos.sbu.unicamp.br/ojs/index.php/manuscrito/article/view/8666500 SP - 283-303 AB - <p>The problem of defining modal operators using contingency as a primitive is discussed by assuming what Lewis and Langford call "Existence Postulate", an axiom which is formulated in the framwork of a modal language with propositional quantifiers. It is shown  that the minimal contingency logic K Δ extended with the contingential counterpart of Existence Postulate is definitionally equivalent to the deontic logic KD extended with propositional quantifiers.</p> ER -