Lesson 4: Assignments and Readings
Analytic Philosophy: An Anthology, pp. 418-424 Ayer;
A Companion to Analytic Philosophy, pp. 205-217 Sprigge (on Ayer)
In the selection from A. J. Ayer's Language, Truth and Logic included in Analytic Philosophy: An Anthology (pp. 418-424), what is Ayer's initial statement of the "criterion of verifiability"? As the essay progresses, Ayer makes several revisions to the initially succinct statement of the criterion -- verification becomes (a) either verification or falsification, then (b) possible verification or falsification, then (c) possible weak verification or falsification. Explain why each of these revisions is required.