article: International Mathematical Olympiad
links: Toronto Mathematical Association of America Veszprém Chiba Prefecture Sunshine Coast, Queensland Mongolia Erfurt Bath, Somerset Saint Petersburg Brașov Paris Sigtuna London Budapest Chiang Mai Province Mumbai Hong Kong Rio de Janeiro Bremen Braunschweig Daejeon Warsaw Saudi Arabia Mérida, Yucatán COVID-19 pandemic Oslo Glasgow Sydney Taipei 2021 International Mathematical Olympiad Hanoi Beijing Washington, D.C. Ljubljana Cetinje Sofia Amsterdam Sinaia 2022 International Mathematical Olympiad Cape Town Belgrade Hungary Tokyo Prague Cluj-Napoca British Hong Kong Shanghai Mar del Plata České Budějovice Joutsa Havana Bucharest Madrid Istanbul Žilina Burgas Moscow East Berlin Canberra Lienz Astana Wrocław Athens Toruń 2020 International Mathematical Olympiad Santa Marta