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The large structures of Grothendieck founded on finite order arithmetic

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(2011)cite http://arxiv.org/abs/1102.1773arxiv:1102.1773Comment: Adds the optimality observation: this is the weakest possible foundation for these tools. The exposition is clarified, the set theory better motivated, and some proofs made fuller.

Abstract

Such large-structure tools of cohomology as toposes and derived categories stay close to arithmetic in practice, yet existing foundations for them go beyond the strong set theory ZFC. We formalize the practical insight by founding the theorems of EGA and SGA, plus derived categories, at the level of finite order arithmetic. This is the weakest possible foundation for these tools since one elementary topos of sets with infinity is already this strong.

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