Swanepoel, Konrad, Martini, Horst and Oloff de Wet, P.
(2009)
*Absorbing angles, Steiner minimal trees and antipodality.*
Journal of Optimization Theory and Applications, 143
(1).
pp. 149-157.
ISSN 0022-3239

## Abstract

We give a new proof that a star {op i :i=1,…,k} in a normed plane is a Steiner minimal tree of vertices {o,p 1,…,p k } if and only if all angles formed by the edges at o are absorbing (Swanepoel in Networks 36: 104–113, 2000). The proof is simpler and yet more conceptual than the original one. We also find a new sufficient condition for higher-dimensional normed spaces to share this characterization. In particular, a star {op i :i=1,…,k} in any CL-space is a Steiner minimal tree of vertices {o,p 1,…,p k } if and only if all angles are absorbing, which in turn holds if and only if all distances between the normalizations equal 2. CL-spaces include the mixed ℓ 1 and ℓ ∞ sum of finitely many copies of ℝ.

Item Type: | Article |
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Official URL: | http://www.springer.com/math/journal/10957 |

Additional Information: | © 2009 Springer |

Library of Congress subject classification: | Q Science > QA Mathematics |

Sets: | Departments > Mathematics |

Rights: | http://www.lse.ac.uk/library/usingTheLibrary/academicSupport/OA/depositYourResearch.aspx |

Date Deposited: | 09 Oct 2009 09:53 |

URL: | http://eprints.lse.ac.uk/25403/ |

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