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Parker vector

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In mathematics, especially the field of group theory, the Parker vector is an integer vector that describes a permutation group in terms of the cycle structure of its elements.

Definition

The Parker vector P of a permutation group G acting on a set of size n, is the vector whose kth component for k = 1, …, n is given by:

where ck(g) is the number of k-cycles in the cycle decomposition of g.

Applications

The Parker vector can assist in the recognition of Galois groups.

References

  • Peter J. Cameron (1999). Permutation Groups. Cambridge University Press. ISBN 0-521-65378-9.
  • Aart Blokhuis (2001). Finite Geometries: Proceedings of the Fourth Isle of Thorns Conference. Springer. ISBN 0-7923-6994-7.