|Similarity: conformity of one or more - but not all - properties of two or more objects.|
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Exact Similarity :/ Armstrong: allows formation of equivalence classes (instead of universals) - per nominalism (Place): then aptitude (as particulars) all exactly similar properties - per universals (Armstrong): many particulars with the same properties.
universals-realist: takes for each class exactly one universal.
Similarity / equality / property / Martin: thesis: we need to rethink the ordinary exact and inexact equality between objects (these need a way, in relation to which they may be the same) instead: similarity between properties.
Similarity: nominalism VsArmstrong: must assume the instantiation of various universlas for every sim. which is not exact ! Multiplication of entities - MartinVsArmstrong: similarity is ontologically the fundamental concept.
AR II = Disp
D. M. Armstrong
Dispositions, Tim Crane, London New York 1996
What is a Law of Nature? Cambridge 1983