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What is IMO 2013 Problems and Solutions about?

1. There exist positive integers m1, m2, ..., mk whose reciprocals sum to 2k-1/n for any positive integers k and n. 2. The minimum number of lines needed to divide the plane into regions containing points of only one color for any Colombian configuration of 4027 points is determined. 3. If the circumcenter of the triangle formed by the feet of the altitudes of triangle ABC lies on the circumcircle of ABC, then triangle ABC is right-angled.

Author

Paopao Fonollera

Language

EN