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Self-identity/(s)>Schmidentity/Identity/Field: true identity is only self-identity - it is not enough when the extensions of the other predicates (other than "is identical to") are up for grabs - less than true identity: E.g. congruence: - is an equivalence relation for which substitutivity applies - identity/Quine: it is not easy to say which facts about us make it, that "is identical to" and "rabbit" stands for rabbits - and not "belong together" or "are of the same" - and by analogy for temporary stages - inflationism: can in turn accept facts - (FieldVsinflationism).
Realism, Mathematics and Modality Oxford New York 1989
Truth and the Absence of Fact Oxford New York 2001
Science without numbers Princeton New Jersey 1980