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Possible objects/Unrealized possibilities/Individuation/Identification/Quine/Dennett: the possible fat man in the entrance and the possible bald man in the entrance: are they the same possible man, or there are two different possible men? Would their similarity make them into one? Are not two possible things equal?.
Possibility/Dennett: Degrees: from weak to strong: 1) logical , 2) physical, 3) biological, 4) historical - (stronger/weaker) - Problem: E.g. time travelling: how to distinguish logical and physical possibility?.
Possibility/Dennett: Lewis: pro graded possibility (Dennett dito) - problem: not the same as accessibility within the Library of Babel (or Mendel ) - this is greater than the universe.
Darwins gefährliches Erbe Hamburg 1997
Spielarten des Geistes Gütersloh 1999