In the world of mathematics, the United States is becoming an outlier.

The International Congress of Mathematicians (ICM) – the world’s most important mathematics conference and the venue for awarding the prestigious Fields Medal – is facing worldwide opposition because the US is hosting this year’s event in Philadelphia in July.

More than 2,300 mathematicians from at least 76 countries have signed an online petition to “move the 2026 ICM out of the US” and “commit not to participate in the ICM if it is to be held in the US”.

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