About: http://webisa.webdatacommons.org/200148998

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	I have seen an equals sign with a small exclamation mark on top being used to say equals because of data that was given in the problem, for example for a boundary condition or initial value in a differential equation.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com