Proof Without Words: The Arithmetic-Geometric-Mean Inequality for Three Positive Numbers
by Claudi Alsina
Counting on Continued Fractions
by Arthur T. Benjamin,
Francis Edward Su, and Jennifer J. Quinn
Venn Said It Couldn't Be Done
by Peter Hamburger and
Raymond E. Pippert
Superexponentiation and Fixed Points of Exponential and Logarithmic Functions
by Stephen R. Wassell
When is the Product of Two Oblong Numbers Another Oblong?
by Trygve Breiteig
Monty Hall Uses a Mixed Strategy
by Herb Bailey
A Convergence Theorem for the Riemann Integral
by Russell A. Gordon
Matrices, Continued Fractions, and Some Early History of
Iteration Theory
by Michael Sormani
From 30 to 60 is Not Twice as Hard
by Michael Dalezman
Euler's Formula for z(2 k), Proved by Induction on k
by Ji Chungang and Chen Yonggao