Évariste Galois (; French: [eva?ist galwa]; 25 October 1811 – 31 May 1832) was a French mathematician and political activist.
While still in his teens, he was able to determine a necessary and sufficient condition for a polynomial to be solvable by radicals, thereby solving a problem standing for 350 years.
His work laid the foundations for Galois theory and group theory, two major branches of abstract algebra, and the subfield of Galois connections.