About: http://webisa.webdatacommons.org/74377307

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	intersecting lines? I know there is a formula, but I just can not find it.
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org