For a large portion of his life, John Nash battled a severe mental illness that necessitated hospitalization. Beginning in 1959, he suffered from schizophrenia, which caused hallucinations. After a period he described as '25 years of partially deluded thinking,' he was able to make a recovery and returned to his work in teaching and research at Princeton University.

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John Nash was an economist and mathematician whose influential 27-page doctoral thesis, completed at Princeton University at age 21, fundamentally advanced game theory. He introduced the concept of the Nash equilibrium to predict outcomes from strategic interactions and proved that such an equilibrium must exist in a broad class of games, a breakthrough that had eluded earlier mathematicians. This proof holds true even when players have diverse motivations, such as selfishness, altruism, or spite. In addition to this foundational work, Nash contributed significantly to bargaining theory and made other pioneering advancements in mathematics, earning him the prestigious Abel Prize. He was a co-recipient of the 1994 Nobel Prize for his work on game theory. His life, which included a long and challenging struggle with schizophrenia, was famously documented in the book and subsequent film 'A Beautiful Mind'.

John Nash (1928–2015)

To cite the ebook, use The CORE Econ Team 2023 The Economy 2.0: Microeconomics Open access e-text https://core-econ.org/the-economy/.

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CORE Econ - The Economy 2.0: Microeconomics

John Nash formally proved that an equilibrium point is guaranteed to exist in a wide variety of strategic games. This finding holds true irrespective of the players' motivations, which can range from purely selfish to altruistic or even spiteful. The proof's significance lies in its utility for analyzing even highly complex games and in solving a problem that earlier eminent mathematicians, including Emile Borel and John von Neumann, had been unable to resolve.

Nash's Proof of the Existence of an Equilibrium

Beyond his work on equilibrium, John Nash also made a path-breaking and highly original contribution to the economic theory of bargaining. This represented another of his major impacts on the field of economics.

John Nash's Contribution to Bargaining Theory

John Nash's influence was not confined to economics; he also made several pioneering contributions to the field of mathematics. In recognition of these significant mathematical achievements, he was awarded the prestigious Abel Prize.

John Nash's Mathematical Contributions and the Abel Prize

In recognition of his groundbreaking work in game theory, John Nash was a co-recipient of the 1994 Nobel Memorial Prize in Economic Sciences.

John Nash's 1994 Nobel Prize in Economics

John Nash's Struggle with Mental Illness

The life story of John Nash, covering his intellectual insights and personal battle with illness, was chronicled in Sylvia Nasar's 2011 biography, 'A Beautiful Mind: The Life of Mathematical Genius and Nobel Laureate John Nash'. This book was later adapted into a popular film starring Russell Crowe.

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