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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 I thought that psychologism was long outdated, in connection with mathematics at least since Frege?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?

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  • uh phenomenology!
    – user34654
    Commented Aug 25, 2018 at 22:08
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    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
    Commented Aug 27, 2018 at 0:08

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