17 and Sudoku Clues

Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

17 is the minimum number of clues required to give a unique sudoku solution - but how did mathematicians prove this?

Featuring James Grime.

Dr James Grime discusses a recent paper which cracked the problem. The paper being discussed by McGuire and others is at http://arxiv.org/abs/1201.0749

James Grime's website is at http://singingbanana.com/