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arXiv · 2610.23489

Stability of Hyperplane Projections of the Regular Simplex and $L_p$-Projection Bodies of balls in $\ell_q^n(\mathbb{R})$

Jacek Jakimiuk·Christos Pandis
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Abstract

We prove stability estimates for extremal hyperplane projections of the regular simplex. We further generalize the analogous stability estimates for $\ell_q$-balls by the first named author and the monotonicity theorem for normalized ratios by Barthe and Naor to the $L_p$-setting. To this end, we derive closed formulas for the support functions of their $L_p$-projection bodies, complementing those obtained by the second named author. A key ingredient in our proofs is a stability refinement of the majorization inequality for Gaussian mixtures.

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Jacek Jakimiuk, Christos Pandis. 2026-10-16. Stability of Hyperplane Projections of the Regular Simplex and $L_p$-Projection Bodies of balls in $\ell_q^n(\mathbb{R})$. https://arxiv.org/abs/2610.23489

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