About: http://webisa.webdatacommons.org/70175074

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	So you can use a function in places where a pointer-to-function is expected, but you can not use a member-function because there is no such thing, only pointer-to-member-function. f in your example is a function.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com