René Gateaux
| René Eugène Gateaux | |
|---|---|
| Born | 5 May 1889 | 
| Died | 3 October 1914 (aged 25) Rouvroy, Pas-de-Calais, France | 
| Cause of death | Killed in action | 
| Nationality | French | 
| Occupation | Mathematician | 
| Military career | |
| Allegiance | France | 
| Service | French Army | 
| Years of service | 1910–1912 1914 | 
| Rank | Lieutenant | 
| Unit | 269th Infantry Regiment | 
| Battles / wars | First World War | 
René Eugène Gateaux (French: [ʁəne øʒɛn ɡɑto]; 5 May 1889 – 3 October 1914) was a French mathematician. He is principally known for the Gateaux derivative, used in the calculus of variations and in the theory of optimal control. He died in combat during World War I. Paul Lévy produced a posthumous edition of his works, extending them considerably, in his Leçons d'analyse fonctionnelle of 1922.