About: http://webisa.webdatacommons.org/451782596

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	Edit: there is a problem in what follows; the fact that $\beta$ must be contained in the interior of $\alpha$ is not true.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net