About: http://webisa.webdatacommons.org/4802460

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	Such a point will always be a saddle point, i.e. a point where $grad(z)$ is zero but it is neither a minimum or a maximum.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com