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: Thursday, August 27, 2015, 12:15 pm

Duration: 30 minutes

Location: CAB G51

Speaker: Gerald Weber (University of Auckland)

Total order is not always best - notes on topological sorting

Topological sorting as an algorithmic problem is often stated as only defined for acyclic graphs, and phrased as finding a total order consistent with a directed graph. I will argue that in several applications in software engineering, cycle detection is so closely intertwined with topological sorting, that a combined algorithm is considerably more useful. Also the so-called stratification of the vertices is at least as important, if not more important, as output of the sorting process. In any case, the stratification has important additional information about the graph, if compared to a total ordering. I will also bring in impressions from a teaching perspective and argue that a more general problem may sometimes be easier to grasp than a narrow problem.

Bio: Gerald Weber is Senior Lecturer in the Department of Computer Science at the University of Auckland. He joined the department in 2003. His research Interests are human centric information systems and models Gerald holds a PhD from the Free University Berlin. He is information director of the Proceedings of the VLDB Endowment and has been program chair of several conferences in Enterprise Systems and Human-Computer Interaction.

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