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Negation/Brandom: task: formulating incompatibilities - everything that is incompatible with "Wulf is a mammal" is incompatible with "Wulf is a dog" but not vice versa.
Definition negation/Brandom: negation of p: the minimum irreconcilable with the statement: the strongest inferential claim that follows from any proposition incompatible with p in a way that fixes a commitment.
Expressive Vernunft Frankfurt 2000
Begründen und Begreifen Frankfurt 2001