ON THE Q-CONSTRUCTION FOR EXACT ∞-CATEGORIES
ON THE Q-CONSTRUCTION FOR EXACT ∞-CATEGORIES
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关于精确 ∞ 范畴的 Q 构造
DOI:
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发表时间:
2014
期刊:
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通讯作者:
J. Rognes
中科院分区:
文献类型:
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作者:
J. Rognes
We prove that the algebraic K-theory of an exact ∞-category can be computed via an ∞-categorical variant of the Q-construction. This construction yields a quasicategory whose weak homotopy type is a delooping of the K-theory space. We show that the direct sum endows this homotopy type with the structure of an infinite loop space, which agrees with the canonical one. Finally, we prove a proto-dévissage result, which gives a necessary and sufficient condition for a nilimmersion of stable ∞-categories to be a K-theory equivalence. In particular, we prove that a well-known conjecture of Ausoni– Rognes is equivalent to the weak contractibility of a particular ∞-category.