We study the approximability of a number of graph problems: treewidth and pathwidth of graphs, one-shot black (and black-white) pebbling costs of directed acyclic graphs, and a variety of different graph layout problems such as minimum cut linear arrangement and interval graph completion. We show that, assuming the recently introduced Small Set Expansion Conjecture, all of these problems are hard to approximate within any constant factor.


Directed Acyclic Graph Interval Graph Tree Decomposition Layout Problem Path Decomposition 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Per Austrin
    • 1
  • Toniann Pitassi
    • 1
  • Yu Wu
    • 1
  1. 1.Department of Computer ScienceUniversity of TorontoCanada

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