Nonredundant 1's in $\Gamma$-Free Matrices

  • Authors:
  • Jeremy P. Spinrad

  • Affiliations:
  • -

  • Venue:
  • SIAM Journal on Discrete Mathematics
  • Year:
  • 1995

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Abstract

This paper studies a new method for representing $\Gamma$-free matrices, which occur in characterizations of chordal bipartite and strongly chordal graphs. We show that the number of $\Gamma$-free matrices with $n$ rows and columns (and thus the number of chordal bipartite and strongly chordal graphs with $n$ vertices) is proportional to $2^\Theta(n \log^{2} n)$, and give an asymptotically space optimal method for storing these matrices.