Nobody will care if the conference isn’t held in Philly. Holding it elsewhere will probably make it a little easier and possibly a little cheaper for people to attend. I doubt mathematicians are part of the 1%, so cash and travel hassle should matter. And given today’s Internet, there’s going to be remote attendance which can happen most anywhere.

While it’s still convenient to gather together to discuss a field, it’s not crucial as it was in past times. Easier to do what’s best for the largest number of people.

Reminds me of:

https://theconversation.com/calls-for-a-boycott-of-the-2026-...

I'm going to guess that for many signers-- or at least the US ones-- their opposition to the United States and "its unbridled hatred" doesn't extend to not accepting funding from the US taxpayer.

Entry requirements and the overhead of dealing with visa hoops are a perennial problem for international conferences, nothing new-- and presumably a part of why it hasn't been held in the US in recent memory. But the language on this petition is particularly extreme.

"The petition follows months of trepidation about the congress within the math community. “You do not get 1,500 signatures in 10 days without having many, many mathematicians already registering their complaints to their professional societies and to the ICM organizers,” says Ila Varma, a mathematician at the University of Toronto and one of the petition’s co-authors."

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ICM's peak attendance is around four thousand, so 1,500 would-be attendees signing a petition to move the conference in ten days is pretty authoritative.

FWIW, the Joint Mathematics Meeting is bigger, based on number of registered attendees [1].

[1] https://jointmathematicsmeetings.org/meetings/national/jmm20...