The primary decomposition conjecture for ideals in acyclic cluster algebras

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Let RR be the ring under consideration, let I1,…,InI_1,\ldots,I_n be its associated ideals, and let a=(a1,…,an)∈Nn\mathbf{a}=(a_1,\ldots,a_n)\in\mathbb{N}^n. Write

Ia=I1a1I2a2⋯Inan.I^{\mathbf{a}}=I_1^{a_1}I_2^{a_2}\cdots I_n^{a_n}.

Here I1a1∩⋯∩InanI_1^{a_1}\cap\cdots\cap I_n^{a_n} denotes the intersection of the corresponding ideal powers.

Primary decomposition conjecture. For all a∈Nn\mathbf{a}\in\mathbb{N}^n,

Ia=I1a1∩I2a2∩…∩Inan.I^{\mathbf{a}}=I_1^{a_1}\cap I_2^{a_2}\cap\ldots\cap I_n^{a_n}.

This conjecture asserts that the product of these ideal powers equals their intersection, extending the familiar equality for coprime ideals to the ideals arising in the cluster-algebra description. Its status is not resolved in the supplied source context.

References

Primary source

Philipp Lampe, “Acyclic cluster algebras from a ring theoretic point of view”, arXiv:1210.1502 (2012).

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