<http://webisa.webdatacommons.org/207006639>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/347738894>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/207006639> .
<http://webisa.webdatacommons.org/207006639>	<http://www.w3.org/ns/prov#value>	"So, b-d must be equal to 0, i.e. b must equal d." .
<http://webisa.webdatacommons.org/207006639>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<mathisfunforum.com> .