About: http://webisa.webdatacommons.org/248800337

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	Given a unit sphere centered at a point other than the foci, if the barycenter of the foci's inverses, with respect to that sphere, coincides with the center, then it is a singularity of the distance polynomial function.
http://www.w3.org/ns/prov#wasQuotedFrom	sdsu.edu