About: http://webisa.webdatacommons.org/312017956

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	, and This relation between ?? and k should be valid so that the plane wave is a solution to the wave equation.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org