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<http://webisa.webdatacommons.org/42132449>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackexchange.com> .
<http://webisa.webdatacommons.org/prov/53892756>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/42132449> .
<http://webisa.webdatacommons.org/42132449>	<http://www.w3.org/ns/prov#value>	"But for some matrices, this equations holds, e.g. A = ..." .