On Rogers-Shephard type inequalities for the lattice point enumerator

In this paper we study various Rogers-Shephard type inequalities for the lattice point enumerator $\mathrm{G}_{n}(\cdot)$ on $\mathbb{R}^n$. In particular, for any non-empty convex bounded sets $K,L\subset\mathbb{R}^n$, we show that $\mathrm{G}_{n}(K+L)\mathrm{G}_{n}\bigl(K\cap(-L)\bigr) \leq\binom{2n}{n} \mathrm{G}_{n}\bigl(K+(-1,1)^n\bigr)\mathrm{G}_{n}\bigl(L+(-1,1)^n\bigr).$ and $\mathrm{G}_{n-k}(P_{H^\perp} K)\mathrm{G}_{k}(K\cap H)\leq\binom{n}{k}\mathrm{G}_{n}\bigl(K+(-1,1)^n\bigr),$ for $H=\mathrm{lin}\{\mathrm{e}_1,\dots,\mathrm{e}_k\}$, $k\in\{1,\dots,n-1\}$. Additionally, a discrete counterpart to a classical result by Berwald for concave functions, from which other discrete Rogers-Shephard type inequalities may be derived, is shown. Furthermore, we prove that these new discrete analogues for $\mathrm{G}_{n}(\cdot)$ imply the corresponding results involving the Lebesgue measure.

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