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Recently, I learnt that there exist people who go so far as to claim that "mathematics is a branch of psychology". I thought that psychologism was long outdated, in connection with mathematics at least since Frege?

What are some good rejections of psychologism?

  • uh phenomenology! – user34654 Aug 25 '18 at 22:08
  • In a sense, psychologism triumphed in analytic philosophy after the decline of logicism and logical positivism. Quine openly declared:"The old epistemology aspired to contain, in a sense, natural science; it would construct it somehow from sense data. Epistemology in its new setting, conversely, is contained in natural science, as a chapter of psychology." Of course, it is a more sophisticated version of psychologism than Mill's was in 19th century, see SEP's Psychologism. – Conifold Aug 27 '18 at 0:08

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