Electrical canonical basis stratification conjecture for electroid varieties

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Let Xn\mathcal{X}_n be the space of electrical networks, let Xτ\mathcal{X}_\tau be the electroid variety indexed by a matching τ\tau on 2n2n points, and let Xτ,>0=Xτ∩Xn,≥0\mathcal{X}_{\tau,>0}=\mathcal{X}_\tau\cap\mathcal{X}_{n,\geq 0}. Let EPE_{\mathbf{P}} be the proposed electrical canonical basis of Gd,nG_{d,n}. Electrical canonical basis stratification conjecture. For every matching τ\tau, the elements EPE_{\mathbf{P}} that do not restrict to zero on Xτ\mathcal{X}_\tau form a basis of the homogeneous coordinate ring C[Xτ]\mathbb{C}[\mathcal{X}_\tau]. Moreover, if EPE_{\mathbf{P}} is not identically zero on Xτ\mathcal{X}_\tau, then it takes strictly positive values on Xτ,>0\mathcal{X}_{\tau,>0}. This conjecture predicts that the electrical canonical basis behaves well under the electroid stratification, both algebraically through restriction and positively on the nonnegative strata.

References

Primary source

Yibo Gao, Thomas Lam and Zixuan Xu, “Electrical networks and the Grove algebra”, arXiv:2208.12798 (2022).

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