About: http://webisa.webdatacommons.org/40162608

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	You can find the proof (of the stronger result Bill alludes to) in e.g. books.google.com/??? or books.google.com/??? Neither argument is particularly hard.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net