Derangements Formula

Lukas Bulwahn

27 June 2015

Abstract

The Derangements Formula describes the number of fixpoint-free permutations as a closed formula. This theorem is the 88th theorem in a list of the ``Top 100 Mathematical Theorems''.
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Theories

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@article{Derangements-AFP,
  author  = {Lukas Bulwahn},
  title   = {Derangements Formula},
  journal = {Archive of Formal Proofs},
  month   = June,
  year    = 2015,
  note    = {\url{http://isa-afp.org/entries/Derangements.html},
            Formal proof development},
  ISSN    = {2150-914x},
}
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