About: http://webisa.webdatacommons.org/221409666

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	Your equation is a special case of this with $\mathbf{a} = f(a)$ and $\mathbf{b} = f(b)$.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com