About: http://webisa.webdatacommons.org/12206889

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 the introduction he pointed out that a plane was a special case of a spherical surface, that is a sphere with infinite radius.
http://www.w3.org/ns/prov#wasQuotedFrom	st-andrews.ac.uk