About: http://webisa.webdatacommons.org/428508558

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	How to explain that a negative number multiplied by a negative number is a positive number, and that -(-x)=x?
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com