About: http://webisa.webdatacommons.org/49068818

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I do not have an answer, but here is a fact that may be useful: The function is decreasing and positive, and hence must decrease to some $L \geq 0$ as $x \rightarrow -\infty$.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com