Eduard Helly
1884  1943  Click the picture above  
Helly worked on functional analysis and proved the HahnBanach theorem in 1912 fifteen years before Hahn published essentially the same proof and 20 years before Banach gave his new setting.  
Full MacTutor biography  [Version for printing]  
List of References (6 books/articles)
Mathematicians born in the same country

 
Other Web sites  
 
JOC/EFR © May 2000
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