About: http://webisa.webdatacommons.org/80395310

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	If E is a set and U an open ball, then>what does EU mean?My immediate guess (without bothering to look at the actual paper) is that it is the old notation (i.e., juxtaposition) for "set product, the old phrase for intersection.
http://www.w3.org/ns/prov#wasQuotedFrom	mathforum.org