What is the {human} for {discoverer or inventor} of {quicksort}
Who is the quicksort discoverer or inventor?
who  is the discoverer or inventor of quicksort?
SELECT DISTINCT ?f WHERE { resource:quicksort property:discoverer_or_inventor ?f . ?f rdf:type ontology:human }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q486598> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P61> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?obj where { wd:Q486598 wdt:P61 ?obj . ?obj wdt:P31 wd:Q5 } 
Tony Hoare