About: http://webisa.webdatacommons.org/398666723

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	vectors a and b is a vector perpendicular to the plane containing a and b.
http://www.w3.org/ns/prov#wasQuotedFrom	slideshare.net