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Lecture Notes in Computer Science
We present the first internal calculi for Lewis' conditional logics characterized by uniformity and reflexivity, including non-standard internal hypersequent calculi for a number of extensions of the logic VTU. These calculi allow for syntactic proofs of cut elimination and known connections to S5. We then introduce standard internal hypersequent calculi for all these logics, in which sequents are enriched by additional structures to encode plausibility formulas as well as diamond formulas.doi:10.1007/978-3-319-66902-1_8 fatcat:ren4zmqudjf2zkrxxdd3pa4oue