Abstract We propose a natural deduction calculus for the modal logic S4.2. The system is designed to match as much as possible the structure and the prop- erties of the standard system of natural deduction for first-order classical logic, exploiting the formal analogy between modalities and quantifiers. The system is proved sound and complete w.r.t. the standard Hilbert-style formulation of S4.2. Normalization and its consequences are obtained in a natural way, with proofs that closely follow the analogous ones for first-order logic.
Id prodotto:
138373
Handle IRIS:
11562/1121587
ultima modifica:
20 aprile 2025
Citazione bibliografica:
Martini, Simone; Masini, Andrea; Zorzi, Margherita,
A natural deduction calculus for S4.2«Notre Dame Journal of Formal Logic»
, vol. 65
, n. 2
, 2024
, pp. 127-150