Abstract
We prove that four spheres in ℝ3 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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Borcea, C., Goaoc, X., Lazard, S. et al. Common Tangents to Spheres in ℝ3 . Discrete Comput Geom 35, 287–300 (2006). https://doi.org/10.1007/s00454-005-1230-y
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DOI: https://doi.org/10.1007/s00454-005-1230-y