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Paper   IPM / M / 8939
School of Mathematics
  Title:   On the number of even permutations with roots
  Author(s):  M. R. Pournaki
  Status:   Published
  Journal: Australas. J. Combin.
  Vol.:  45
  Year:  2009
  Pages:   37-42
  Supported by:  IPM
Let π be an even permutation on n letters which has a root, that is, there exists an even permutation ξ such that π = ξ2. In this article the number of this kind of π is found by using generating function techniques. This is the analogue of a result for the number of all permutations with roots.

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