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Are enumerative definitions necessarily extensional?
Intuitively, it seems natural to use the expression "enumerative definition" about both enumerations of objects and of types of objects. What makes a definition enumerative is, in my opinion, that it gives a disjunction of sufficient criteria. If you define "farm animal" as "horse, sheep, pig, chicken etc." we would have an enumerative definition, but not an extensional.
