Take a look at Nash's publications: http://www.ams.org/notices/199810/milnor.pdf http://www.ams.org/notices/199810/milnor.pdf After his first hospitalization i

Take a look at Nash's publications: http://www.ams.org/notices/199810/milnor.pdf http://www.ams.org/notices/199810/milnor.pdf After his first hospitalization in 1959 Nash only wrote two more papers in the 60s. Nash's schizophrenia definitely put a stop to his work.