<http://webisa.webdatacommons.org/prov/472604757>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/156820540> .
<http://webisa.webdatacommons.org/156820540>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/156820540>	<http://www.w3.org/ns/prov#value>	"We construct a decreasing sequence G_0,G_1,G_2,... of open subsets of D, each including A, as follows." .
<http://webisa.webdatacommons.org/156820540>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<oswego.edu> .