This HTML5 document contains 4 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

PrefixNamespace IRI
isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
n4stanford.
Subject Item
isa:167860354
rdf:type
prov:Entity
prov:value
Substantial improvements were produced (see above) even in classes traditionally regarded as necessarily difficult, among them calculus, physics, chemistry, and economics.
prov:wasQuotedFrom
n4:edu
Subject Item
isap:17215520
prov:wasDerivedFrom
isa:167860354