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AI, Me and Lewis (Abelian Implication, Material Equivalence and CI Lewis 1920)

Meyer, Robert


C I Lewis showed up Down Under in 2005, in e-mails initiated by Allen Hazen of Melbourne. Their topic was the system Hazen called FL (a Funny Logic), axiomatized in passing in Lewis 1921. I show that FL is the system MEN of material equivalence with negation. But negation plays no special role in MEN. Symbolizing equivalence with → and defining ∼ A inferentially as A→f, the theorems of MEN are just those of the underlying theory ME of pure material equivalence. This accords with the treatment...[Show more]

CollectionsANU Research Publications
Date published: 2008
Type: Journal article
Source: Journal of Philosophical Logic
DOI: 10.1007/s10992-007-9070-2


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