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

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, April 26, 2011, 12:15 pm

Duration: This information is not available in the database

Location: CAB G51

Speaker: Edward D. Kim (TU Delft)

Polyhedral graph abstractions and weaker versions of the Hirsch Conjecture

Combinatorial abstractions of the graphs of polyhedra are receiving renewed interest as an approach to the Linear Hirsch and Polynomial Hirsch Conjectures, since Santos disproved the Hirsch Conjecture, which was relevant in the theoretical worst-case running time of the simplex method for linear programming. We will give a survey of some known combinatorial abstractions. Then we show how they fit into a more general framework, which leads to some variants of these earlier abstractions. This flexible framework is defined by combinatorial properties, with each collection of properties taken providing a variant for studying the diameters of polyhedral graphs. We present a variant which has superlinear diameter, which together with some combinatorial operations gives a concrete approach for disproving the Linear Hirsch Conjecture. The talk is completely self-contained and no prior knowledge is assumed.


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