Leonhard (ˈleːɔnhart). 1707–83, Swiss mathematician, noted esp for his work on the calculus of variation: considered the founder of modern mathematical analysis
2.
Ulf (Svante) von (ʊlf fɔn). 1905–83, Swedish physiologist: shared the Nobel prize (1970) for physiology or medicine with Julius Axelrod and Bernard Katz for their work on the catecholamines: son of Hans von Euler-Chelpin