<http://webisa.webdatacommons.org/197821842> <http://www.w3.org/ns/prov#wasQuotedFrom> <readingpenrose.com> . <http://webisa.webdatacommons.org/prov/131117478> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/197821842> . <http://webisa.webdatacommons.org/197821842> <http://www.w3.org/ns/prov#value> "T is a scalar field and h is a vector field, and so that???s why we can and should apply our new trick: if we have the scalar field, we can derive the vector field." . <http://webisa.webdatacommons.org/prov/516234944> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/197821842> . <http://webisa.webdatacommons.org/197821842> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .