Question: When did Flemming Topsøe's father die?
Sentence (from "Flemming Topsøe"): Flemming Topsøe (born 25 August 1938 in Aarhus, Denmark) is a Danish mathematician, mathematics docent at University of Copenhagen where he has worked since 1964 and author of several mathematical science works, among them works about analysis, probability theory and information theory.
Relevant evidence: No