Galois

    
 Évariste Galois was a French mathematician born in Borg-la-Reine. 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 long-standing problem. His work laid the foundations for Galois theory and group theory, two major branches of abstract algebra, and the subfield of Galois connections. He was the first to use the word "group" (French: groupe) as a technical term in mathematics to represent a group of permutations.He died from wounds suffered in a duel under questionable circumstances at the age of twenty.
      When talking about Galois,the first impression is that this guy really has talents for mathematics.He used his unique way to change the whole world mathematics.The idea of group and his Galois theory really had a huge influence in mathematics.His theory made one of the most important branches of mathematics-abstract algebra have a big development.He was the first person to find the connections between the category of field and the category of group.What  he did is really of great use in modern mathematics.Unfortunately,this man died in a duel for a girl.His death is really a big pity for mathematics.