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Signs / laws of nature: there is no sign for the law of gravity ! Phenomena are only circumstantial evidence!
Signified: always is a particulate fact as is the sign. There is no sign for the general! ((s) So not for the applicability of the laws of nature!)
AR II = Disp
D. M. Armstrong
Dispositions, Tim Crane, London New York 1996
What is a Law of Nature? Cambridge 1983