Tangent Spheres and Triangle Centers

@article{Eppstein2001TangentSA,
  title={Tangent Spheres and Triangle Centers},
  author={D. Eppstein},
  journal={Am. Math. Mon.},
  year={2001},
  volume={108},
  pages={63-66}
}
  • D. Eppstein
  • Published 2001
  • Mathematics, Computer Science
  • Am. Math. Mon.
Any four mutually tangent spheres in R^3 determine three coincident lines through opposite pairs of tangencies. As a consequence, we define two new triangle centers. 

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