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Prominent members of the Circle included Rudolf Carnap, Otto Neurath, Herbert Feigl , Philipp Frank, Friedrich Waissman , Hans Hahn. They were visited on occasion by Hans Reichenbach , Kurt Gödel, Carl Hempel , Alfred Tarski, W. V. Quine, and A. J. Ayer (who popularized their work in Britain). Karl Popper, though he never attended the Circle's meetings, was influential in the reception and criticism of their doctrines.
For some time a few of the group's members met regularly with Ludwig WittgensteinLogic and the philosophy of language, critically examining the task of conventional philosophy and its relation to the nature of language. Ludwig Wittgenstein ( April 26, 1889 April 29, 1951) was an Austrian-born philosopher who contributed several ground.