A simple proof that $\pi$ is irrational
Ivan Niven
Source: Bull. Amer. Math. Soc. Volume 53, Number 6
(1947), 509.
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Permanent link to this document: http://projecteuclid.org/euclid.bams/1183510788
Mathematical Reviews number (MathSciNet): MR0021013
Zentralblatt MATH identifier: 0037.31404
Bulletin of the American Mathematical Society
