<http://webisa.webdatacommons.org/102994736>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<xemacs.org> .
<http://webisa.webdatacommons.org/102994736>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/54798215>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/102994736> .
<http://webisa.webdatacommons.org/102994736>	<http://www.w3.org/ns/prov#value>	"if B is a non-square matrix with the same number of columns" .