This year we also included ten international students — students on IMO teams from other countries. Each week, Po-Shen Loh posts a set of five questions on Expii, ramping up in difficulty from accessible to intense. Po-Shen Loh: The win was a surprise, and now it means the future will be stronger for the US. For a gentler introduction to some concepts in this year’s International Mathematical Olympiad, National Coach Po-Shen Loh highlights several through his puzzles this week on Expii here. If you look at mathematics — if you’ve built the concept structure, when you reason about the problem, you’re reasoning in large concepts.

Source: International New York Times July 18, 2016 16:01 UTC