About: http://webisa.webdatacommons.org/165209921

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 think the critical points are (0,0), (2,4) and (-2,-4) but im not sure, and again im having trouble determining whether the points are a max/min or saddle point.
http://www.w3.org/ns/prov#wasQuotedFrom	mathhelpforum.com