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A comment on How has mathematics gotten so abstract?. Parent comment

Re:How has mathematics gotten so abstract? by drdeca on Tuesday September 30, 2025 @08:44PM (#45433065)
Can one do QFT in an ultrafinitistic foundations? My guess is no.

Also, I don’t think ZF sans the axiom of infinity works as an ultrafinitistic theory? It still has every natural number, just not the set of all of them.

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