About: http://webisa.webdatacommons.org/186949120

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 use of letters in mathematics as variables, general numbers, and later for other things such as functions, operators, vectors, etc. started in renaissance.
http://www.w3.org/ns/prov#wasQuotedFrom	enotes.com