<http://webisa.webdatacommons.org/prov/14199744>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/86505322> .
<http://webisa.webdatacommons.org/86505322>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<mathforum.org> .
<http://webisa.webdatacommons.org/prov/15499479>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/86505322> .
<http://webisa.webdatacommons.org/86505322>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/86505322>	<http://www.w3.org/ns/prov#value>	"He also wrote commentaries on Aristotle's books, and wrote books of his own on topics such as astronomy and economics." .