What is the {discoverer or inventor} and the {named after} of {Titanium} ?
An inventor was named after Titanium- who?
Who is the Inventor who was named after Titanium?
SELECT ?g ?z WHERE { resource:titanium property:named_after ?z . resource:titanium property:discoverer_or_inventor ?g }
 SELECT ?ans_1 ?ans_2 WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q716> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P61> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_1. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q716> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P138> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?ans_2. } 
SELECT ?ans_1 ?ans_2 WHERE { wd:Q716 wdt:P61 ?ans_1 . wd:Q716 wdt:P138 ?ans_2 }
Friedrich Wöhler titan