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10/16/2007

April 20–April 26, 2010

Problem

Find all the functions that satisfy the following equation

Solution

here

List of solvers

Peiyush Jain, Lloyd Sakazaki, John Lee, Congpa You, Joshua Lim, Jonathan Cross, Nam Namtran, Aparna Khare, Anand Rajagopalan, Crispin Pereira, Philipp Janert.

Joshua Lim wins the prize!