Sergei Drozdov has published his nice proof using hyperbolic simplexes of the necessary and sufficient condition on the radii of spheres that sit inside and outside a Euclidean simplex in any dimension.
https://www.sciencedirect.com/science/article/pii/S0166218X25004809?dgcid=author
Greg Egan
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2025-09-03 21:46:04 UTC
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