A Fast Approximation Algorithm for Computing theFrequencies of Subgraphs in a Given Graph

  • Authors:
  • Richard A. Duke;Hanno Lefmann;Vojtech Rodl

  • Affiliations:
  • -;-;-

  • Venue:
  • SIAM Journal on Computing
  • Year:
  • 1995

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Abstract

In this paper we give an algorithm which, given a labeled graph on $n$ vertices and a list of all labeled graphs on $k$ vertices, provides for each graph $H$ of this list an approximation to the number of induced copies of $H$ in $G$ with total error small. This algorithm has running time $O(n^{{1 \over \log \log n}} \cdot M(n))$, where $M(n)$ is the time needed to square a $n$ by $n$ matrix with 0, 1-entries over the integers. The main tool in designing this algorithm is a variant of the regularity lemma of Szemeredi.