About: http://webisa.webdatacommons.org/214538690

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	Chapter 4 is a good introduction to integral quadratic forms in general, and sums of three squares in particular.
http://www.w3.org/ns/prov#wasQuotedFrom	ubc.ca