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Definition Supervenience/Brandom: a vocabulary supervenes on another if and only if there could be no two situations in which true statements (i.e. facts), formulated, would differ in supervenient vocabulary, while the true statements, formulated in the vocabulary, that supervenes on it, do not differ - neutral: if it is clear what one is commited to in one language, it is also clear what one is committed to in the other.
Supervenience/Brandom: here: vocabularies in terms of appearance/reality: weaker than reduction (when phenomenalism): the actual conditions of perception are crucial.
Expressive Vernunft Frankfurt 2000
Begründen und Begreifen Frankfurt 2001