<http://webisa.webdatacommons.org/142053733>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<stackexchange.com> .
<http://webisa.webdatacommons.org/prov/54602879>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/142053733> .
<http://webisa.webdatacommons.org/142053733>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/142053733>	<http://www.w3.org/ns/prov#value>	"let, $f(k) = k^5 - k$ where k is a natural number" .