The Spherical Hadwiger Theorem

Suijie Wang; Shengguo Wu

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arXiv · 2608.27305

The Spherical Hadwiger Theorem

Suijie Wang·Shengguo Wu

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Abstract

We prove the spherical Hadwiger classification in every dimension. For $n\geq1$, every continuous $SO(n+1)$-invariant valuation on the space of all closed spherical convex sets in $\mathbb{S}^n$ can be written uniquely as a linear combination of the spherical intrinsic volumes $V_0,\ldots,V_n$. The same classification holds when the domain is restricted to sets contained in an open hemisphere. The proof is inductive: it reduces the problem to a vanishing statement for simple valuations and uses a continuous alternating cocycle on tuples of spherical points together with a signed coning transform. Through the cone--sphere correspondence, this yields, for $d\geq2$, the corresponding classification of continuous $SO(d)$-invariant conic valuations on all closed convex cones in $\mathbb{R}^d$, without imposing normalization at the zero cone. In particular, $SO$-invariance implies $O$-invariance in both settings.

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Suijie Wang, Shengguo Wu. 2026-09-13. The Spherical Hadwiger Theorem. https://arxiv.org/abs/2608.27305

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