Huihui

Nash's advisor and former Carnegie Tech professor, R.J. Duffin, wrote a letter of recommendation consisting of a single sentence: "This man is a genius."[4] Nash was accepted by Harvard University; but the chairman of the mathematics department of Princeton, Solomon Lefschetz, offered him the John S. Kennedy fellowship, which was enough to convince Nash that Harvard valued him less.[5] Thus he went to Princeton where he worked on his equilibrium theory. He earned a doctorate in 1950 with a 28-page dissertation on non-cooperative games.[6] The thesis, which was written under the supervision of Albert W. Tucker, contained the definition and properties of what would later be called the "Nash equilibrium". These studies led to four articles:In the book A Beautiful Mind, author Sylvia Nasar explains that Nash was working on proving a theorem involving elliptic partial differential equations when, in 1956, he suffered a severe disappointment when he learned of an Italian mathematician, Ennio de Giorgi, who had published a proof a couple of months[vague] before Nash achieved his proof. Each took different routes