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The distinction between actual and probable verification was upheld by :

  • A.Schlick
  • B.Ayer
  • C.Carnap
  • D.Wittgenstein

Answer: B

The distinction is upheld by Ayer.

In Language, Truth and Logic (1936), A. J. Ayer distinguishes practical verifiability from verifiability in principle, and the strong sense of verification, in which experience conclusively establishes a proposition, from the weak sense, in which experience can only make it probable. He adopts the weak criterion: a statement is meaningful if some observation is relevant to its truth or falsity. This is the distinction between actual and probable verification the question refers to.

Schlick, Carnap and Wittgenstein are all linked with the verification principle in the Vienna Circle period, but the strong and weak senses of verification, conclusive against merely probable, are Ayer's own formulation in that book, which is why the paper names him.

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