Thread-set conjecture for iterated localizations of stratified tensor triangulated categories

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Let T{\mathcal{T}} be a rigidly-compactly generated tensor triangulated category, stratified in the sense of Balmer–Favi, whose Balmer spectrum Spc⁡(Tc)\operatorname{Spc}({\mathcal{T}}^c) is noetherian and has finite Krull dimension. For a tuple A=(A1,…,Ak){\mathbb{A}}=(A_1,\dots,A_k) of subsets of Spc⁡(Tc)\operatorname{Spc}({\mathcal{T}}^c), a thread set is a chain T⊆Spc⁡(Tc)T\subseteq\operatorname{Spc}({\mathcal{T}}^c) containing elements ai∈T∩Aia_i\in T\cap A_i with a1⊇⋯⊇aka_1\supseteq\cdots\supseteq a_k. Let LA{\mathbb{L}}_{\mathbb{A}} denote the associated iterated localization.

Thread-set conjecture. Let A{\mathbb{A}} and B{\mathbb{B}} be tuples of subsets of Spc⁡(Tc)\operatorname{Spc}({\mathcal{T}}^c). If they have the same thread sets, then there is a canonical natural isomorphism

LA≅LB.{\mathbb{L}}_{\mathbb{A}}\cong {\mathbb{L}}_{\mathbb{B}}.

The conjecture proposes that the composition of localizations is determined by the combinatorics of chains of Balmer primes in the indexing subsets, and hence by the Balmer spectrum. Its status is not resolved in the supplied source.

References

Primary source

Nicola Bellumat, “A conjecture on the composition of localizations on a stratified tensor triangulated category”, arXiv:2303.01334 (2025).

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