<http://webisa.webdatacommons.org/146088017>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/146088017>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackexchange.com> .
<http://webisa.webdatacommons.org/prov/153178468>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/146088017> .
<http://webisa.webdatacommons.org/146088017>	<http://www.w3.org/ns/prov#value>	"If I understand things correctly, there is a whole family of such surfaces, differing in the angle of ..." .