René Gateaux

René Eugène Gateaux
René Eugène Gateaux
Born	5 May 1889; Vitry-le-François, Marne, France
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/branch	French Army
Years of service	1910–12; 1914
Rank	Lieutenant
Unit	269th Infantry Regiment
Battles/wars	First World War Western Front Battle of the Frontiers Battle of Grand Couronné; ; Race to the Sea †; ;

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.

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