Monotonicity conjecture for normal cyclic polytopes

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Let Cd(τ1,…,τn)C_d(\tau_1,\dotsc,\tau_n) and Cd(τ1′,…,τn′)C_d(\tau_1',\dotsc,\tau_n') be integral cyclic polytopes, and let Δij\Delta_{ij} denote the corresponding gaps used in the source. Assume that Cd(τ1,…,τn)C_d(\tau_1,\dotsc,\tau_n) is normal, meaning that lattice points in all positive dilates decompose as sums of lattice points of the polytope. Monotonicity conjecture. If Cd(τ1,…,τn)C_d(\tau_1,\dotsc,\tau_n) is normal and

τj′−τi′≥Δijfor all 1≤i<j≤n,\tau_j'-\tau_i'\geq\Delta_{ij}\qquad\text{for all }1\leq i<j\leq n,

then Cd(τ1′,…,τn′)C_d(\tau_1',\dotsc,\tau_n') is also normal. The statement is motivated by the preceding conjectures and a theorem in the paper, but no resolution is supplied.

References

Primary source

Takayuki Hibi, Akihiro Higashitani, Lukas Katthän and Ryota Okazaki, “Normal cyclic polytopes and cyclic polytopes that are not very ample”, arXiv:1202.6117 (2013).

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