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A performative self-contradiction is an inconsistency that holds not between two propositional contents but between a content c which some speaker S claims is true (or in a sense comparable to that of being true: is valid in a certain way) and at least one presupposition among the presuppositions that are necessary and jointly sufficient to warrant taking S’s act of claiming (e.g. asserting that p) as a valid act of claiming. Apel (unlike Habermas) develops this concept into the doctrine of rationally definitive justification (“Letztbegründung”).

Discourse Ethics beyond Apel and Habermas. A Realistic Relaunch