Full Idea
'Socrates is human' is true if 1) subject referent is identical with a predicate referent (Nominalism), 2) subject reference member of the predicate set, or the subject has that property (Platonism), 3) predicate set a member of the subject set (Montague)
Gist of Idea
Three ways for 'Socrates is human' to be true are nominalist, platonist, or Montague's way
Source
Alex Orenstein (W.V. Quine [2002], Ch.3)
Book Reference
Orenstein,Alex: 'W.V. Quine' [Princeton 2002], p.70
A Reaction
Orenstein offers these as alternatives to Quine's 'inscrutability of reference' thesis, which makes the sense unanalysable.