About: http://webisa.webdatacommons.org/301892034

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	,j]+(curl[i,j]/R-curl[i,j-1]/R) where curl[i,j]=x[i,j]-x[i+1,j]+y[i,j+1]-y[i,j]; and R is a real number greater than one. 18.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk