Publications by Year: 2005

2005
Stephanou Y. First-order modal logic with an 'actually' operator. Notre Dame Journal of Formal Logic. 2005;46(4):381-405.Abstract
In this paper the language of first-order modal logic is enriched with an operator @ (‘actually’) such that, in any model, the evaluation of a formula @A at a possible world depends on the evaluation of A at the actual world. The models have world-variable domains. All the logics that are discussed extend the classical predicate calculus, with or without identity, and conform to the philosophical principle known as serious actualism. The basic logic relies on the system K, whereas others correspond to various properties that the actual world may have. All the logics are axiomatized.
First-order modal logic with an 'actually' operator.pdf