### Abstract

Given n terminals in the Euclidean plane and a positive constant, find a Steiner tree interconnecting all terminals with the minimum number of Steiner points such that the Euclidean length of each edge is no more than the given positive constant. This problem is NP-hard with applications in VLSI design, WDM optical networks and wireless communications. In this paper, we show that (a) the Steiner ratio is 1/4, that is, the minimum spanning tree yields a polynomial-time approximation with performance ratio exactly 4, (b) there exists a polynomial-time approximation with performance ratio 3, and (c) there exists a polynomial-time approximation scheme under certain conditions.

Original language | English (US) |
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Pages (from-to) | 83-99 |

Number of pages | 17 |

Journal | Theoretical Computer Science |

Volume | 262 |

Issue number | 1-2 |

DOIs | |

State | Published - Aug 2 2001 |

Externally published | Yes |

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### Keywords

- Approximation algorithms
- Steiner trees
- VLSI design
- WDM optical networks

### ASJC Scopus subject areas

- Theoretical Computer Science
- Computer Science(all)

### Cite this

*Theoretical Computer Science*,

*262*(1-2), 83-99. https://doi.org/10.1016/S0304-3975(00)00182-1