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.html},
Formal proof development},
ISSN = {2150-914x},
}
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