Two hardness results on feedback vertex sets

  • Authors:
  • Wei Jiang;Tian Liu;Tienan Ren;Ke Xu

  • Affiliations:
  • Key Laboratory of High Confidence Software Technologies, Ministry of Education, Peking University, Beijing, China;Key Laboratory of High Confidence Software Technologies, Ministry of Education, Peking University, Beijing, China;Key Laboratory of High Confidence Software Technologies, Ministry of Education, Peking University, Beijing, China;National Lab of Software Development Environment, Beihang University, Beijing, China

  • Venue:
  • FAW-AAIM'11 Proceedings of the 5th joint international frontiers in algorithmics, and 7th international conference on Algorithmic aspects in information and management
  • Year:
  • 2011

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Abstract

A feedback vertex set is a subset of vertices whose deletion makes the remaining graph a forest. We show that the minimum FVS (MFVS) in star convex bipartite graphs is NP-hard to find, and give a tighter lower bound on the size of MFVS in sparse random graphs, to provide further evidence on the hardness of random CSPs.