Graph Isomorphism is in SPP

  • Authors:
  • V. Arvind;Piyush P. Kurur

  • Affiliations:
  • Institute of Mathematical Sciences, Chennai 600113, India;Institute of Mathematical Sciences, Chennai 600113, India

  • Venue:
  • Information and Computation
  • Year:
  • 2006

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Abstract

We show that Graph Isomorphism is in the complexity class SPP, and hence it is in @?P (in fact, in Mod"kP for each k=2). These inclusions for Graph Isomorphism were not known prior to membership in SPP. We derive this result as a corollary of a more general result: we show that a generic problem FIND-GROUP has an FP^S^P^P algorithm. This general result has other consequences: for example, it follows that the hidden subgroup problem for permutation groups, studied in the context of quantum algorithms, has an FP^S^P^P algorithm. Also, some other algorithmic problems over permutation groups known to be at least as hard as Graph Isomorphism (e.g., coset intersection) are in SPP, and thus in Mod"kP for each k=2.