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Ukrainian number theorist Maryna Viazovska is among the four winners of the 2022 Fields Medal, one of the highest honours in mathematics, which is conventionally awarded to people under 40. The other winners are James Maynard, a number theorist at the University of Oxford, UK; June Huh, a specialist in combinatorics at Princeton University in New Jersey; and Hugo Duminil-Copin, who studies statistical physics at the Institute of Advanced Scientific Studies near Paris. The International Mathematical Union (IMU) announced the winners at an award ceremony in Helsinki on 5 July.