Dao and Takahashi's infinite-radius conjecture for resolving subcategories

Let RR be a Cohen--Macaulay local ring, and let X\mathcal{X} be a resolving subcategory of modR\operatorname{mod} R. A module is maximal Cohen--Macaulay if its depth equals dimR\operatorname{dim} R; call it non-MCM when it is not maximal Cohen--Macaulay. Dao and Takahashi's conjecture. If X\mathcal{X} contains a non-MCM module MM, then X\mathcal{X} has infinite radius. This conjecture extends Dao and Takahashi's theorem that a resolving subcategory containing a module of positive finite projective dimension has infinite radius; the general Cohen--Macaulay case remains open.

Sources & referencesView supporting material

Primary source

Yuki Mifune, “On the finiteness of radii of resolving subcategories”, arXiv:2308.05296 (2023).

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