John Forbes Nach, born June 13 in 1928, is an American Mathematician. He wrote theories and now his theories are used in market, economics or accounting. He shared a Nobel, memorial prize in economic sciencies. He was the subject of a hollywood film too, the film was called "A beautiful mind" is based on his biopraphy. Nash developpeda doctorate in 1950, the thesis, wich spoke about the definition and properties of the "Nash equilibrium", it's the concept of cooperative games, he said that we just have to try to look for the better in the group, and on the other hand looking for be better wich ourselves. He also had schizophrenia and he went to a hospital, it was better for him however, he couldn't continue making theories. The recoveres from schizophrenia and he left the hospital, then he continued making theories.