logical positivism
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Logical positivism was a philosophical movement that claimed only statements that can be tested and verified through observation are truly meaningful, dismissing things like metaphysics and religion as nonsensical. It mattered because it deeply influenced how science and philosophy approached knowledge in the early 20th century, though most philosophers later rejected its strict rules as too limiting.
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Collage of prominent figures associated with logical positivism / logical empiricism. From left to right, top to bottom: Moritz Schlick, Rudolf Carnap, Otto Neurath, Hans Hahn, Friedrich Waismann, Herbert Feigl, Hans Reichenbach, Carl Gustav Hempel, and A. J. Ayer.
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