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Exact Similarity/Armstrong: allows formation of equivalence classes (instead of universals) - Nominalism (Place) pro: then properties (as individuals) all exactly similar properties - Representatives of universals (Armstrong): many individuals with the same property - universals realist: Assumes exactly one universal for each class.
Induction/ArmstrongVsMartin/VsPlace: as nominalists, they cannot assume a nuclear higher order state that connects the universals.
Property/Nominalism/Martin/Place: are individuals! - Therefore no strict identity between different manifestations or occurrences of properties. - Instead: "exact similarity" - Causation: principle: "The same causes the same" - ArmstrongVs: that's just a cosmic regularity and thus as a whole a cosmic coincident! - ArmstrongVs: pro universals view: explains why the same property in the same circumstances produces the same effects (not just the same) - principle: "the identical causes the identical"
Similarity: NominalismVsArmstrong: must assume the instantiation of different universals for every similarity that is not exact! Multiplication - MartinVsArmstrong: Similarity ontologically as basic concept.
AR II = Disp
D. M. Armstrong
Dispositions, Tim Crane, London New York 1996
What is a Law of Nature? Cambridge 1983