Single Idea 16932

[catalogued under 19. Language / C. Assigning Meanings / 3. Predicates]

Full Idea

'Projectible' predicates are predicates F and G whose shared instances all do count, for whatever reason, towards confirmation of 'All F are G'. ….A projectible predicate is one that is true of all and only the things of a kind.

Gist of Idea

Projectible predicates can be universalised about the kind to which they refer

Source

Willard Quine (Natural Kinds [1969], p.115-6)

Book Reference

Quine,Willard: 'Ontological Relativity and Other Essays' [Columbia 1969], p.115


A Reaction

Both Quine and Goodman are infuriatingly brief about the introduction of this concept. 'Red' is true of all ripe tomatoes, but not 'only' of them. Hardly any predicates are true only of one kind. Is that a scholastic 'proprium'?