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Publisher: University of Warwick. Department of Computer Science
Languages: English
Types: Other
Subjects: BC
This report presents a technical result concerning practical proof systems for counterfactual (also known as conditional) logics. In a 1983 paper, HCM de Swart gave sequent based proof systems for two counterfactual logics: Stanlaker's VCS and Lewis's VC. In this report I demonstrate that de Swart's system for VC is incorrect by giving a counterexample. This counterexample does not effect de Swart's system for VCS. Then I give a new sequent based proof system for VC together with soundness and completeness proofs. The system I give is closely modelled on de Swart's.
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