About: http://webisa.webdatacommons.org/407124650

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	The idea of letting a variable, such as a or x, represent a number that could be either positive or negative was developed around 1659.
http://www.w3.org/ns/prov#wasQuotedFrom	edurite.com