The validity of synthetic statements is not established merely by the definition of the words or symbols they contain. Synthetic statements, or empirical propositions, assert or deny something about the real world. Tautologies are true by definition, and thus their validity does not depend on empirical testing.
According to Ayer, the statements of logic and mathematics are tautologies. A tautology is a repetition of the meaning of a statement, using different words or symbols. A tautology is a statement that is necessarily true, true by definition, and true under any conditions. Criterion of meaning Īccording to Ayer, analytic statements are tautologies. The title of the book was taken ("To some extent plagiarized" according to Ayer) from Friedrich Waismann's Logik, Sprache, Philosophie. Language, Truth and Logic brought some of the ideas of the Vienna Circle and the logical empiricists to the attention of the English-speaking world.Īccording to Ayer's autobiographical book, Part of My Life, it was work he started in the summer and autumn of 1933 that eventually led to Language, Truth and Logic, specifically Demonstration of the Impossibility of Metaphysics-later published in Mind under the editorship of G.E.
Ayer explains how the principle of verifiability may be applied to the problems of philosophy. Language, Truth and Logic is a 1936 book about meaning by the philosopher Alfred Jules Ayer, in which the author defines, explains, and argues for the verification principle of logical positivism, sometimes referred to as the criterion of significance or criterion of meaning.
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