[過去ﾛｸﾞ] Inter-universal geometry と ABC予想 (応援スレ) 77 (1002ﾚｽ)
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250(3): 現代数学の系譜 雑談 ◆yH25M02vWFhP 11/05(水)10:13 ID:K/Lr81ky(2/12) AAS
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（追加）>>247より
外部ﾘﾝｸ:mathoverflow.net
How strong a set theory is necessary for practical purposes in sheaf theory?
asked May 14, 2020 user158035
Is it known how much of ZFC is actually necessary for the basic, familiar constructions and theorems in sheaf theory, along the lines of section II.1 (and its exercises) in Hartshorne's "Algebraic Geometry" textbook?

1 Answer
Colin McLarty has looked into this
The large structures of Grothendieck founded on finite order arithmetic, Review of Symbolic Logic 13 issue 2 (2020) pp. 296--325, doi:10.1017/S1755020319000340, 外部ﾘﾝｸ[1773]:arxiv.org
with abstract (emphasis added):
省5

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