<http://webisa.webdatacommons.org/454145885>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/454145885>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<upenn.edu> .
<http://webisa.webdatacommons.org/prov/54798215>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/454145885> .
<http://webisa.webdatacommons.org/454145885>	<http://www.w3.org/ns/prov#value>	"Suppose B is a matrix whose columns are a set of orthonormal basis vectors, and we want to find the coefficients (relative to B) for some arbitrary vector a." .