"In so far as theories of mathematics speak about reality, they are not certain, and in so far as they are certain, they do not speak about reality."
— Mathematics

January 1, 1970

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Mathematics
Original Language: English

Sources

Albert Einstein, Geometrie and Erfahrung (1921) pp. 3 f. as cited by Karl Popper, The Two Fundamental Problems of the Theory of Knowledge (2014) Tr. Andreas Pickel, Ed. Troels Eggers Hansen.