Generalized lattice-point bound for families of convex bodies

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Let K1,…,Kn⊂RdK_1,\dotsc,K_n\subset\mathbb{R}^d be convex bodies and let Λ\Lambda be a lattice. Let e1,…,ed\mathbf{e}_1,\dotsc,\mathbf{e}_d be a basis of Λ\Lambda, and let Λi\Lambda^i be the Z\mathbb{Z}-span of 0,e1,…,ei0,\mathbf{e}_1,\dotsc,\mathbf{e}_i. Let q1⩾q2⩾⋯⩾qd⩾qd+1q_1\geqslant q_2\geqslant\dotsb\geqslant q_d\geqslant q_{d+1} be positive integers satisfying

DKj∩qi(Λ∖Λi−1)=∅\mathfrak{D}K_j\cap q_i(\Lambda\setminus\Lambda^{i-1})=\varnothing

for all 1⩽j⩽n1\leqslant j\leqslant n and 1⩽i⩽d1\leqslant i\leqslant d, and

(Kj−Kl)∩qd+1Λ=∅(K_j-K_l)\cap q_{d+1}\Lambda=\varnothing

for all 1⩽j,l⩽n1\leqslant j,l\leqslant n with j≠lj\neq l. Here DKj=Kj−Kj\mathfrak{D}K_j=K_j-K_j and G(Kj,Λ)G(K_j,\Lambda) denotes the lattice-point enumerator used in the source.

Generalized lattice-point bound conjecture. Under these conditions,

∑j=1nG(Kj,Λ)⩽∏i=1dqi.\sum_{j=1}^n G(K_j,\Lambda)\leqslant\prod_{i=1}^d q_i.

The conjecture is presented as a more general form of the Betke–Henk–Wills inequality. The source does not provide a resolution of this general statement; it proves the relevant bound for ellipsoids and discusses weaker problems that would imply the desired inequality.

References

Primary source

Romanos-Diogenes Malikiosis, “Lattice-point enumerators of ellipsoids”, arXiv:1202.3876 (2012).

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