About: http://webisa.webdatacommons.org/422308455

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	But while I am talking about generating functions, $e$ is a very special number because of its relationship to exponential generating functions, and the appearance of $e$ in the derangement problem is a reflection of this.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net