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Reports (Research Report) Year : 2004

Common Tangents to Spheres in R^3


We prove that four spheres in $\R^3$ have infinitely many real common tangents if and only if they have aligned centers and at least one real common tangent.


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inria-00070675 , version 1 (19-05-2006)


  • HAL Id : inria-00070675 , version 1


Ciprian Borcea, Xavier Goaoc, Sylvain Lazard, Sylvain Petitjean. Common Tangents to Spheres in R^3. [Research Report] RR-5325, INRIA. 2004, pp.16. ⟨inria-00070675⟩
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