Derangements Formula

 

Title: Derangements Formula
Author: Lukas Bulwahn (lukas /dot/ bulwahn /at/ gmail /dot/ com)
Submission date: 2015-06-27
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''.
BibTeX:
@article{Derangements-AFP,
  author  = {Lukas Bulwahn},
  title   = {Derangements Formula},
  journal = {Archive of Formal Proofs},
  month   = jun,
  year    = 2015,
  note    = {\url{http://isa-afp.org/entries/Derangements.shtml},
            Formal proof development},
  ISSN    = {2150-914x},
}
License: BSD License