The indecomposable-real-element conjecture for superunitary regions

Let A\mathcal{A} be a cluster algebra with a good basis B\mathfrak{B}, and let Bir\mathfrak{B}_{ir} be the subset of indecomposable real elements, where an element bb is real if b2Bb^2\in\mathfrak{B} and indecomposable if every factorization b=cdb=cd with c,dBc,d\in\mathfrak{B} has an invertible factor. For bBb\in\mathfrak{B}, write fbf_b for its associated function. The indecomposable-real-element conjecture. The B\mathfrak{B}-superunitary region is the subset of A(R>0)\mathcal{A}(\mathbb{R}_{>0}) on which fb1f_b\geq1 for every bBirb\in\mathfrak{B}_{ir}:

AB(R1)={pA(R>0)fb(p)1 for every bBir}.\mathcal{A}_{\mathfrak{B}}(\mathbb{R}_{\geq1})=\{p\in\mathcal{A}(\mathbb{R}_{>0})\mid f_b(p)\geq1\text{ for every }b\in\mathfrak{B}_{ir}\}.

This would imply equality with the ordinary superunitary region whenever the indecomposable real elements are precisely the cluster variables. The supplied text gives no resolution.

Sources & referencesView supporting material

Primary source

Emily Gunawan and Greg Muller, “Superunitary regions of cluster algebras”, arXiv:2208.14521 (2022).

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