18 June 2009

• 10:0210:02, 18 June 2009 diff hist +2 2009 USAMO Problems/Problem 4 →Solution

12 June 2009

• 09:5509:55, 12 June 2009 diff hist +924 2009 USAMO Problems/Problem 4 →Problem
• 09:3909:39, 12 June 2009 diff hist +378 N 2009 USAMO Problems/Problem 4 New page: == Problem == For <math>n \ge 2</math> let <math>a_1</math>, <math>a_2</math>, ..., <math>a_n</math> be positive real numbers such that <cmath> (a_1+a_2+ ... +a_n)\big( {1 \over a_1} + {1...