Toric g-vector Kruskal–Katona conjecture for simple polytopes

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Let PP be a simple polytope, and let (γi(P))(\gamma_i(P)) and (gi(P))(g_i(P)) denote its γ\gamma-vector entries and toric gg-vector entries, respectively. Toric g-vector Kruskal–Katona conjecture. If the γ\gamma-vector entries of PP satisfy the Kruskal–Katona inequalities, then the toric gg-vector entries of PP satisfy the Kruskal–Katona inequalities as well. This would extend the known relationship between toric gg-polynomials and face numbers of simplicial complexes beyond the cube, and is suggested by results on γ\gamma-vectors of simple polytopes.

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Primary source

Richard Ehrenborg, Gábor Hetyei and Margaret Readdy, “Parking trees and the toric g-vector of nestohedra”, arXiv:2511.04815 (2026).

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