Electrical canonical basis stratification conjecture for electroid varieties

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=XτXn,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.

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Primary source

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

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