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The Bézout inequality for mixed volumes characterizes simplices

Dylan Langharst, Shouda Wang

math.MGarXiv:2609.20380

Abstract

We prove that the Bézout inequality for mixed volumes characterizes simplices among full dimensional convex bodies in every dimension, resolving a conjecture of Soprunov and Zvavitch. We give two separate proofs of the conjecture. Along the way, we also prove characterizations of simplices in terms of longest chords or relative inradii.

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