About: http://webisa.webdatacommons.org/142521646

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	A unit column vector ei is next defined so that it contains zeroes in all its elements except the ???i??? element which is valued +1 or ???1 alternatively, i.e. ei=(0 0 . . . +/???1 0 . . . 0)???.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr