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11 September 2026 · The mathematicians

Twenty-six Fields Medalists sign a warning

Three days after the Navier-Stokes announcement, 26 Fields Medalists signed a declaration. They warn that AI companies do serious damage to mathematics when they use unsolved problems as benchmarks, test problems to show what a model can do. According to the signatories, this produces answers without producing understanding.

By Mara Masaeva · Updated 29 September 2026

PoliticsDevelopingThe story is still developing. There is one source so far, or the numbers are still changing.

What happened

The Fields Medal is the closest thing mathematics has to a Nobel Prize. It goes to at most four people every four years. Twenty-six of them signing the same document does not happen often.

The signatories do not claim the proof is wrong. Their objection is about what an open problem is for. A Millennium Prize Problem marks a question mathematicians do not yet understand. In their view, the value of solving one has always been the understanding people build along the way.

Terence Tao, who signed, pointed to the effect on how researchers behave. If a rumour is enough to set ten thousand agents on your problem, you stop telling people what you are working on.

What may follow

I find this counterargument unusual because it is not about danger. It says nothing about extinction or cyberattacks. A profession says that getting answers handed to it costs something it needs.

Compare it with the paper on phages. The same kind of system that may help produce antibiotics that work also erodes the practice through which researchers learned to find such things.

It also falls outside the usual debate between alarm and hype. The harm the mathematicians describe does not come from an accident or from misuse. It comes from the technology doing what it was built to do.

What I do not know

I have not linked the text of the declaration or the list of signatories yet. What I write here rests on reporting about it.

My notes

For a room in Leuven, I bring this one out when someone says the worry about AI is an American internet obsession. Twenty-six of the best living mathematicians object on grounds that have nothing to do with x-risk, the risk that AI wipes out humanity. They worry that their own field loses something.

It also lets people in the room be ambivalent, without having to be for or against.

Read next

Sources

  1. Science: how an AI math breakthrough ignited a controversypress · main source · not read end to end yet
  2. Wikipedia: Navier-Stokes priority controversyresearch · not read end to end yet

    For now the easiest place to find the declaration and its signatories. To be replaced by the declaration itself.