On the one hand, we have the a priori propositions of logic and pure mathematics, stating relations between concepts which are true by definition on the other, we have propositions purporting to state empirical matters of fact.
The key idea, built on the foundations of classical empiricism, was that there are only two types of meaningful proposition. It was an iconoclastic work that razed traditional metaphysics to the ground through its introduction of the verification principle of meaning. Summary : Language, Truth and Logic, written in 1935 when the British philosopher Alfred Jules Ayer was a mere twenty-four years old, instantly propelled its author into the philosophical firmament, and became the “manifesto” of logical positivism (during its short-lived heyday).
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