Isomorphism for graphs embeddable on the projective plane

  • Authors:
  • David Lichtenstein

  • Affiliations:
  • -

  • Venue:
  • STOC '80 Proceedings of the twelfth annual ACM symposium on Theory of computing
  • Year:
  • 1980

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Abstract

There are no known polynomial time algorithms for graph isomorphism. For certain classes of graphs, however, efficient algorithms have been found. In particular, there is a polynomial time algorithm for isomorphism of planar graphs [4,5]. This paper presents a generalization of the third theorem to the projective plane, allowing a straightforward adaptation of the planar algorithm to the projective plane. Gary Miller has subsequently generalized my result to surfaces of arbitrary genus, so that there is now a graph isomorphism algorithm which is polynomial for any fixed genus.