Stapledon's positivity conjecture for coefficients of equivariant Ehrhart series

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Let GG be a finite group acting on a lattice polytope PP, and let H∗[z]=∑j≥0Hj∗zjH^*[z]=\sum_{j\geq 0}H^*_jz^j be its equivariant H∗H^*-series. Let h∗[z]h^*[z] be the ordinary h∗h^*-polynomial of PP. Stapledon's positivity conjecture. If H∗[z]H^*[z] is a polynomial and the ithi^{\text{th}} coefficient of h∗[z]h^*[z] is positive, then the trivial representation occurs with non-zero multiplicity in the virtual character Hi∗H^*_i. This conjecture predicts that positivity in the ordinary h∗h^*-polynomial forces the corresponding equivariant coefficient to contain the trivial representation; the supplied text gives no resolution status for the general statement.

References

Primary source

Federico Ardila, Mariel Supina and Andrés R. Vindas-Meléndez, “The equivariant Ehrhart theory of the permutahedron”, arXiv:1911.11159 (2020).

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