Lines Tangent to 2n-2 spheres in Rn
Frank Sottile, Thorsten Theobald
math.AGarXiv:math/0105180
Abstract
We show that there are 3 · 2(n-1) complex common tangent lines to 2n-2 general spheres in Rn and that there is a choice of spheres with all common tangents real.
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