About: http://webisa.webdatacommons.org/75811946

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	The homogeneous coordinate system represents all points <math>(kx,ky,kz)</math>, where k is a constant, as the single point <math>(x,y,z)</math> on the Real Projective Plane.
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org