|Abstraction: Subsumption of objects by non-consideration of certain properties. See also equivalence relation, concretion, concreta, indiscernibility.|
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Abstraction / Armstrong: always states: particulars considered "particularity" mere abstraction, as well as property or relation without particulars, no "naked" part. or rel. - particularity and universality are real abstractions and therefore real in the states - E.g. a particular: abstraction from all states where it occurs, example of a propertiy: from all situations where the particular has the prop F: F-ness.
AR II = Disp
D. M. Armstrong
Dispositions, Tim Crane, London New York 1996
What is a Law of Nature? Cambridge 1983