Existence of non-commutative crepant resolutions for Gorenstein toric algebras

Let RR be a Gorenstein toric algebra, meaning the coordinate ring associated to a Gorenstein cone. An NCCR of RR is an algebra of the form Λ=EndR(M)\Lambda=\operatorname{End}_R(M) for MrefRM\in\operatorname{ref}R such that gldimΛ<\operatorname{gl}\dim\Lambda<\infty and ΛCMR\Lambda\in\operatorname{CM}R. Gorenstein toric NCCR existence conjecture. Every Gorenstein toric algebra has an NCCR. The source describes existence of NCCRs as unclear in general and subsequently proves existence for simplicial and almost simplicial affine toric Gorenstein algebras, so the unrestricted statement remains open.

Sources & referencesView supporting material

Primary source

Aimeric Malter and Artan Sheshmani, “Non-commutative crepant resolutions for (almost) simplicial toric algebras”, arXiv:2602.21802 (2026).

Additional references

3 papers in this index state this conjecture (2022–2026). The statement above is taken from the most recent of them; the others are arXiv:2509.11664, arXiv:2207.09703.

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