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American Mathematical Monthly publishes articles, notes, and other features about mathematics and the profession. AMM readers span a broad spectrum of mathematical interests, and include professional mathematicians as well as students of mathematics at all collegiate levels.

Publisher: Mathematical Association of America

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Volume 116, Number 1, January 2009

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Free Content Why Did Lagrange "Prove" the Parallel Postulate?
pp. 3-18(16)
Author: Grabiner, Judith V.

Free Content Overhang
pp. 19-44(26)
Authors: Paterson, Mike; Zwick, Uri

Free Content Does Lipschitz with Respect to x Imply Uniqueness for the Differential Equation y′ = f(x, y)?
pp. 61-66(6)
Authors: Cid, José Ángel; Pouso, Rodrigo López

Free Content Yet Another Proof of the Irrationality of √2
pp. 68-69(2)
Authors: Ferreño, Natalia Casás

Free Content A General Lagrange Theorem
pp. 70-74(5)
Author: Panti, Giovanni

Free Content A Note on the Congruence (ndmd) ≡ (nm) (mod q)
pp. 75-77(3)
Authors: Meštrović, Romeo

Free Content Problems and Solutions
pp. 82-89(8)
Authors: Edgar, Gerald A.; Hensley, Doug; West, Douglas B.

Free Content Reviews
pp. 90-94(5)
Author: Talvila, Erik

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