“Opera Omnia, ser. 1, vol. 2, p. 241, as quoted by George Pólya, Induction and Analogy in Mathematics Vol. 1, Mathematics and Plausible Reasoning (1954) and by Pólya in "Heuristic Reasoning in the Theory of Numbers" The American Mathematical Monthly Vol. 66, No. 5 (May, 1959), p. 375.”
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