ARTICLES
Galimatias Arithmeticae
by Paulo Ribenboim
The Newest Inductee in the Number Hall of Fame
by Colin C. Adams
The Crossing Number of Cm x Cn: A Reluctant Induction
by Nadine C. Myers
Leibniz's Formula, Cauchy Majorants, and Linear Differential Equations
by Michael Mezzino and Mark Pinsky
NOTES
Unity in a Field
by H. G. Grundman
Will the Real Non-Euclidean Parabola Please Stand Up?
by Michael Henle
Math Bite: The Volume of a Cone, Without Calculus or Square Roots
by Vaughan Pratt
Proof Without Words: The Length of a Polygonal Arch
by Philip Mallinson
The Incredibly Knotty Checkerboard Challenge
by Louis Zulli
Proof Without Words: Double Angle Formulas
by Yihnan David Gau
Two Diophantine Equations Studied by Ramanujan
by Michael D. Hirschhorn
PROBLEMS
Proposals 1559-1563
Quickies 885-886
Solutions 1534-1538
Answers 885-886
REVIEWS
NEWS AND LETTERS
Acknowledgments
Index to Volume 71