Exact Formulae for the Lovász Theta Function of Sparse Circulant Graphs

  • Authors:
  • Valentino Crespi

  • Affiliations:
  • -

  • Venue:
  • SIAM Journal on Discrete Mathematics
  • Year:
  • 2004

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Abstract

The Lovász theta function has attracted much attention for its connection with diverse issues such as communicating without errors and computing large cliques in graphs. Indeed, this function enjoys the remarkable property of being computable in polynomial time despite being sandwiched between clique and chromatic numbers, two well-known, hard to compute quantities.In this paper I provide a closed formula for the Lovász function of all the circulant graphs of degree 4 with even displacement, thus generalizing Lovász results on cycle graphs (circulant graphs of degree 2).