Eduard Helly (1884 - 1943)

* 1 June 1884, † 28 November 1943

Eduard Helly was born on 1 June 1884 in Vienna, Austria. Helly worked on functional analysis and proved the Hahn-Banach theorem in 1912 fifteen years before Hahn published essentially the same proof and 20 years before Banach gave his new setting. Eduard Helly died on 28 November 1943 in Chicago, Illinois, USA.