A simplex-based measure of symmetry

• URL: http://arxiv.org/abs/2607.03815v1
• Date: Sat, 04 Jul 2026 10:50:29 GMT
• Title: A simplex-based measure of symmetry
• Abstract summary: For compact convex sets $L,K subset mathbbRn$, denote by $_K(L)$ the smallest size of a homothet of $K$ that contains $L$.<n>Motivated by the expressivity of ReLU neural networks, we study the depth complexity of polytopes in $mathbbRn$ under the two operations: Minkowski sum and convex hull of a union.
• Score: 1.3249299424572234
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: For compact convex sets $L,K \subset \mathbb{R}^n$, denote by $λ_K(L)$ the smallest size of a homothet of $K$ that contains $L$. We define a measure of symmetry based on the $n$-simplex $Δ= Δ^n \subset \mathbb{R}^n$ as the ratio \[ ρ_Δ(L):=\frac{λ_{-Δ}(L)}{λ_Δ(L)}. \] We study this measure and deduce the following results: (1) The classical Minkowski measure of symmetry $m^*(L)$ can be defined as an affine-invariant version of $ρ_Δ(L)$. (2) We improve the stability analysis for the Minkowski measure of symmetry; if $m^*(L)\ge n-\varepsilon$ then $L$ is $\tfrac{1}{1-\varepsilon}$-close to $Δ$ in the Banach--Mazur distance. (3) We obtain a novel characterization of simplices as the only convex bodies $K$ for which the function $L \mapsto λ_K(L)$ is additive (a property we term ``outer additivity''). (4) Motivated by the expressivity of ReLU neural networks, we study the depth complexity of polytopes in $\mathbb{R}^n$ under the two operations: Minkowski sum and convex hull of a union. We prove the sharp bound $ρ_Δ(P) \leq 2^d -1$ for every polytope $P$ of depth complexity $d$. In other words, simplices cannot be approximated by low-depth polytopes.

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