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Let $M_{n, m}(\mathbb{R})$ be the space of $n\times m$ real matrices. Define $\mathcal{K}_o^{n,m}$ as the set of convex compact subsets in $M_{n,m}(\mathbb{R})$ with nonempty interior containing the origin $o\in M_{n, m}(\mathbb{R})$, and $\mathcal{K}_{(o)}^{n,m}$ as the members of $\mathcal{K}_o^{n,m}$ containing $o$ in their interiors. Let $\Phi: M_{1, m}(\mathbb{R}) \rightarrow [0, \infty)$ be a convex function such that $\Phi(o)=0$ and $\Phi(z)+\Phi(-z)>0$ for $z\neq o.$ In this paper, we propose the $m$th order Orlicz projection operator $\Pi_{\Phi}^m: \mathcal{K}_{(o)}^{n,1}\rightarrow \mathcal{K}_{(o)}^{n,m}$, and study its fundamental properties, including the continuity and affine invariance. We establish the related higher-order Orlicz-Petty projection inequality, which states that the volume of $\Pi_{\Phi}^{m, *}(K)$, the polar body of $\Pi_{\Phi}^{m}(K)$, is maximized at origin-symmetric ellipsoids among convex bodies with fixed volume. Furthermore, when $\Phi$ is strictly convex, we prove that the maximum is uniquely attained at origin-symmetric ellipsoids. Our proof is based on the classical Steiner symmetrization and its higher-order analogue. We also investigate the

Author

Zhou, Xia; Ye, Deping; Zhang, Zengle

Published

2025

Language

EN