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Joined 2026-09-21 Message
Tagged: Work by Ivan Niven
Bulletin of the American Mathematical Society 53(6), page 509. DOI: doi.org/10.1090/S0002-9904-1947-08821-2
One-page original article scan: nonagon.org/ExLibris/sites/default/files/pdf/Niven-Pi-Irrational.pdf
The factorial-normalized polynomial, its integer endpoint derivatives and the positive integral tending to zero provide the complete elementary proof.