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A first generation of 20th-century Viennese positivists began its activities, strongly influenced by Mach, around 1907. Notable among them were a physicist, Philipp Frank, mathematicians Hans Hahn and Richard von Mises, and an economist and sociologist, Otto Neurath. This small group was also active during the 1920s in the Vienna Circle of logical positivists, a seminal discussion group of gifted scientists and philosophers that met regularly in Vienna, and in the related Berlin Society for Empirical Philosophy. These two schools of thought, destined to develop into an almost worldwide and controversial movement, were built on the empiricism of Hume, on ...(100 of 7460 words)