About: http://webisa.webdatacommons.org/430463604

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	is not the positive value ($i$) the principal square root of $-1$? (with principal not meaning better IMHO, but simply the simplest - the positive, as the square root is a function and can not yield two values for the same $x$).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com