Evariste Galois’s birthday
Evariste Galois (25.10.1811 – 31.05.1832) was a prominent French mathematician who founded higher algebra. For the twenty years of his life Galois managed to make discoveries putting him at the same level as famous 19th-century mathematicians. By solving the theory of algebraic equations he laid the foundation of modern algebra and developed such fundamental notions as the Group (Galois was the first to use this term while researching symmetrical) and the Field (finite fields bear the name of the Galois Fields).
Galois studied an old problem that the best mathematicians had not been able to solve from the 16th century. It was to find a common solution to an equation of an arbitrary degree, i.e. present its roots through coefficients using arithmetic.