About: http://webisa.webdatacommons.org/109291297

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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 answer (to the question In general relativity, are light-like curves light-like geodesics?, PSE/q/76170) a particular example of a curve is discussed whose tangent is everywhere null and ...
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com