Borel, Emile (1871–1956)

Emile Borel
Emile Borel was a French mathematician who worked on divergent series, the theory of functions, probability, and game theory, and was the first to define games of strategy. He also founded measure theory, which applies the theory of sets to the theory of functions, and thus became an originator, with Henri Lebesgue and René Louis Baire (1874–1932), of the modern theory of functions of a real variable.