Language, Truth and Logic

Sir Alfred Jules "Freddie" Ayer (1910-1989) was a British philosopher known for his promotion of logical positivism, particularly in his books Language, Truth, and Logic (1936) and The Problem of Knowledge (1956). This book defines, explains, and argues for the verification principle of logical positivism, sometimes referred to as the "criterion of significance" or "criterion of meaning". It explains how the principle of verifiability may be applied to the problems of philosophy