About: http://webisa.webdatacommons.org/109971778

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	This mini-lesson explains sets, including the concept of the universal set as well as operations on sets.
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org