About: http://webisa.webdatacommons.org/41579947

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	In mathematics, a semigroup is an algebraic structure consisting of a set together with an associative binary operation.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org