Question: What is the name after Dirac delta function,that has death date of 1984-10-20?
Paraphrase: What is the name for the 1984.10.20 death date after Dirac delta function?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q209675 wdt:P138 ?answer . ?answer wdt:P570 ?x FILTER(contains(YEAR(?x),'1984'))}
Answer: Paul Dirac