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6. Mathematics / C. Sources of Mathematics / 10. Constructivism / e. Psychologism

[maths only exists as human psychological states]

3 ideas
Mental states are irrelevant to mathematics, because they are vague and fluctuating [Frege]
There is always something psychological about inference [Russell]
There is not an exclusive dichotomy between the formal and the logical [Harré/Madden]