Improved n 1-cover discovery using perimeter coverage information
International Journal of Sensor Networks
From the Kneser-Poulsen conjecture to ball-polyhedra
European Journal of Combinatorics
The 2-center problem in three dimensions
Proceedings of the twenty-sixth annual symposium on Computational geometry
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If a finite set of balls of radius π/2 (hemispheres) in the unit sphere Sn is rearranged so that the distance between each pair of centers does not decrease, then the (spherical) volume of the intersection does not increase, and the (spherical) volume of the union does not decrease. This result is a spherical analog to a conjecture by Kneser (1954) and Poulsen (1955) in the case when the radii are all equal to π/2.