Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar Talk Information |

**Date and Time**: Tuesday, October 23, 2012, 12:15 pm

**Duration**: 30 minutes

**Location**: CAB G51

**Speaker**: Sonoko Moriyama (Tohoku University)

The smallest enclosing ball problem (for short, the SEB problem) is known as one of classical problems of computational geometry. Given a set of n points in a d dimensional space, this problem is to find the d dimensional ball with the smallest radius which encloses all the n points of P. Szabo and Welzl in 2001 showed that if all the n points are affinely independent, the SEB problem is formulated as finding a unique sink on a unique sink orientation on an n-dimensional cube, called an SEB cube. There is another combinatorial condition defined on a unique sink orientation, Holt-Klee condition proposed by Holt and Klee in 1999. The Holt-Klee condition represents a directed version of the n-connectivity property of a unique sink orientation. In this talk, we prove that every SEB cube satisfies the Holt-Klee condition.

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