About: http://webisa.webdatacommons.org/168383900

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	it is not completely tight, but it works surpisingly well for some theorems, like Poincare conjecture -- see, e.g. my answer to the linked question.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net