About: http://webisa.webdatacommons.org/20370711

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	According to the classic book Clifford Algebra to Geometric Calculus (CAGC), a versor is a product of vectors, and those vectors need not be invertible.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org