This year, Jan Vonk (BEL), Peter Vandendriessche (BEL) and Hojoo Lee (KOR) submitted a geometry problem for the IMO proposals. It was submitted by The Committee of Flemish Mathematical Olympiads to The 50th IMO in Germany. And we got it :]
HERE, you can find our purely geometric proof. The proposers are TRIPLY happy because this problem together with the solution is a result of cowork of THREE persons. Yeap, we proved again that Mathematics is NOT a one man’s job!
