Lower bounds for three algorithms for the transversal hypergraph generation

  • Authors:
  • Matthias Hagen

  • Affiliations:
  • University of Kassel, Research Group Programming Languages, Methodologies, Kassel, Germany

  • Venue:
  • WG'07 Proceedings of the 33rd international conference on Graph-theoretic concepts in computer science
  • Year:
  • 2007

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Abstract

The computation of all minimal transversals of a given hypergraph in output-polynomial time is a long standing open question known as the transversal hypergraph generation. One of the first attempts on this problem--the sequential method [Ber89]--is not output-polynomial as was shown by Takata [Tak02]. Recently, three new algorithms improving the sequential method were published and experimentally shown to perform very well in practice [BMR03, DL05, KS05]. Nevertheless, a theoretical worst-case analysis has been pending. We close this gap by proving lower bounds for all three algorithms. Thereby, we show that none of them is output-polynomial.