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Negation/Frege: does not distinguish between internal and external negation.
Terms/Negation/Wessel: singular terms and categorical terms (which include everything) can not be negated - general terms can be negated - negation of singular terms: only possible in a range of 2 items and again leads to a singular term - "non-object": no term! - Negation of "swimmer" is not "non-swimmers".
Logik Berlin 1999