The toric quotient conjecture for hybrid fans

Let WGL(V)W \subset \mathrm{GL}(V) be a finite reflection group preserving a lattice MVM \subset V and an MM-rational complete simplicial fan ΣV\Sigma \subset V. Let XΣX_\Sigma be the associated toric variety, and let ΣW\Sigma_W denote the hybrid fan. Toric quotient conjecture. The quotient XΣ/WX_\Sigma/W under the induced action of WW is isomorphic to the toric variety XΣWX_{\Sigma_W} associated with the hybrid fan ΣW\Sigma_W. This would extend the previously known variety-level constructions for normal fans of weight polytopes and for simple non-degenerate WW-symmetric polytopes to the potentially non-proper actions addressed by the hybrid fan construction.

Sources & referencesView supporting material

Primary source

Tao Gui, “Complete simplicial fans, Stanley–Reisner rings, and equivariant h-polynomials”, arXiv:2605.15061 (2026).

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