Author： Pizzi Claudio
Publisher： Springer Publishing Company
ISSN： 0039-3215
Source： Studia Logica, Vol.85, Iss.3, 2007-04, pp. : 395-410
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Abstract
The paper introduces a contingential language extended with a propositional constant τ axiomatized in a system named K∆τ , which receives a semantical analysis via relational models. A definition of the necessity operator in terms of ∆ and τ allows proving (i) that K∆τ is equivalent to a modal system named K□τ (ii) that both K∆τ and K□τ are
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