Abstract

The negative part of Wittgenstein's treatment of rule-following in the Philosophical Investigations is a critique of Platonic theories of meaning. The main argument, summarized in §§ 201-202 is a reductio: if Platonism were true, the difference between obeying and disobeying a linguistic rule would vanish. For Platonism requires the rule-follower to have in his mind something which will completely determine in advance all the correct applications of a descriptive word, but this is a requirement that could not be conceivably satisfied. — The analogy which Wittgenstein finds for the Platonist's "super-idealization" of the rule-follower's mental equipment — the analogy of the "machine-as-symbol" (§§ 193-194) indicates the connection between his treatment of this topic and his philosophy of mathematics.