About: http://webisa.webdatacommons.org/197047876

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	Learning the notation, then, is a first step to learning the distinctive logical doctrines of Principia Mathematica.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net