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Denial of the Synthetic A Priori1

  • Oliver A. Johnson (a1)

In his essay “Logical Empiricism”, in the anthology Twentieth Century Philosophy, Professor Feigl writes: “All forms of empiricism agree in repudiating the existence of synthetic a priori knowledge.” 2 Schlick makes the same point even more forcibly: “The empiricism which I represent believes itself to be clear on the point that, as a matter of principle, all propositions are either synthetic a posteriori or tautologous; synthetic a priori propositions seem to it to be a logical impossibility.”3 The denial of synthetic a prioris is a major thesis of the logical empiricist position, being found in the writings of most of the leaders of the movement.4 The reason for its importance is fairly clear. It provides a formula on which the empiricists can base their critique of traditional philosophy. To use Ayer's phrase, denial of the synthetic a priori results in “the elimination of metaphysics”. The philosophical tradition to which the empiricists are opposed and whose “metaphysics” they wish to eliminate can be called, somewhat loosely, rationalism.

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Cf., for example, C. H. Langford , “A Proof that Synthetic A Priori Propositions Exist”, The Journal of Philosophy, 46 (1949), 20–4

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  • ISSN: 0031-8191
  • EISSN: 1469-817X
  • URL: /core/journals/philosophy
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