About: http://webisa.webdatacommons.org/382902340

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 this page, a picture will often mostly take care of defining a variable, but there should be a bit of explanatory text that refers to the picture for each variable, anyway.
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org