K-theory non-detection conjecture for stable infinity-categories

Let C\mathcal{C} and D\mathcal{D} be small stable \infty-categories, and let hn1Ch_{n-1}\mathcal{C} denote their stable nn-categorical truncations. Let K\mathrm{K} denote nonconnective algebraic KK-theory.

K-theory non-detection conjecture. There is no natural number nn such that, for all such C\mathcal{C} and D\mathcal{D}, an equivalence

hn1Chn1Dh_{n-1}\mathcal{C}\simeq h_{n-1}\mathcal{D}

as stable nn-categories implies

K(C)K(D).\mathrm{K}(\mathcal{C})\simeq\mathrm{K}(\mathcal{D}).

The conjecture is motivated by examples where stable higher-categorical truncations agree while algebraic KK-theory differs; the authors note that Schlichting established the analogous n=1n=1 phenomenon for triangulated categories.

Sources & referencesView supporting material

Primary source

Benjamin Antieau, “On the uniqueness of infinity-categorical enhancements of triangulated categories”, arXiv:1812.01526 (2021).

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