Problem of the Week
BUGCAT
Zassenhaus Conference
Hilton Memorial Lecture
BingAWM
Math Club
Actuarial Association
After 150 years, Euler's conjecture that there is no pair of orthogonal Latin squares of order 6 was proved by Tarry around 1900. The proof was long. Almost a century later, two short proofs were found. I will present one of them, due to Stinson in 1984.