What is <used by> of <theory of relativity> ?
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What is the theory of relativity used for?
SELECT DISTINCT ?l WHERE { ?l property:used_by resource:theory_of_relativity }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1535> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q43514>. }
select distinct ?answer where { ?answer wdt:P1535 wd:Q43514}
spacetime interval proper length proper distance