Journal of Combinatorial Optimization

, Volume 27, Issue 1, pp 78–87 | Cite as

On certain geometric properties of the Yao–Yao graphs

  • Iyad A. Kanj
  • Ge Xia


We show that, for any constant \(\rho > 1\), there exists an integer constant \(k\) such that the Yao–Yao graph with parameter \(k\) defined on a civilized unit disk graph is a geometric spanner of stretch factor \(\rho \). This improves the results of Wang and Li in several aspects, as described in the paper. This partially answers an open problem posed by Demaine, Mitchell and O’Rourke about the spanner properties of Yao–Yao graphs. We also show that the Yao–Yao graph with parameter \(k=4\) defined on the complete Euclidean graph is not plane.


Yao graphs Yao–Yao graphs Unit disk graphs Spanners 


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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.School of ComputingDePaul UniversityChicagoUSA
  2. 2.Department of Computer Science, Acopian Engineering CenterLafayette CollegeEastonUSA

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