Monthly Archives: December 2009

17 x 17: A nonprogress report

The question again: Is there a four-coloring of the 17-by-17 grid in which none of the 18,496 rectangles have the same color at all four corners? As I said last time, Bill Gasarch would not have put a bounty on … Continue reading

Posted in computing, mathematics | 23 Comments

The 17×17 challenge

William Gasarch is not the Clay Mathematics Institute. He isn’t paying a million bucks for proofs of famous conjectures. But Gasarch is putting up 172 of his own dollars for the solution to an intriguing little stumper. And the prize … Continue reading

Posted in computing, mathematics | 58 Comments