The Edge-Tangent Sphere of a Circumscriptible n-Simplex

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Wu, Yu-Dong and Zhang, Zhi-Hua (2007) The Edge-Tangent Sphere of a Circumscriptible n-Simplex. Research report collection, 10 (3).


A n−simplex is circumscriptible if there is a sphere tangent to each of its n(n + 1)/2 edges. We prove that the radius of the edge-tangent sphere is at least √((n(n−1))/2) times the radius of its inscribed sphere. This settles affirmatively a part of a problem posed by the authors.

Item type Article
Subjects Historical > FOR Classification > 0101 Pure Mathematics
Current > Collections > Research Group in Mathematical Inequalities and Applications (RGMIA)
Keywords inequality, simplex, edge-tangent sphere
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