About: http://webisa.webdatacommons.org/268240508

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	If R is $(a,b)R(c,d) \iff a+d =b+c$ show that R is an equivalence relation.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com