About: http://webisa.webdatacommons.org/41211636

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	Since the light is a form of energy, (x,y) must be non zero and finite, that is 0 < f(x,y) < infinity.
http://www.w3.org/ns/prov#wasQuotedFrom	ijri.org