Lellmann, Bjorn; Pattinson, Dirk
We present unlabelled cut-free sequent calculi for Lewis' conditional logic and extensions, in both the languages with the entrenchment connective and the strong conditional. The calculi give rise to Pspace-decision procedures, also in the language with the weak conditional. Furthermore, they are used to prove the Craig interpolation property for all the logics under consideration, and yield a Pspace-decision procedure for a recently considered hybrid version of .
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