"He is a mathematical genius." 
 
 So ends a recommendation letter written for the late John Forbes Nash, Jr., who was applying to attend Prince University's graduate college in 1948. The famed mathematician, whose life was the subject of Oscar-winning film A Beautiful Mind, is globally recognized for his research in game theory, as well as his struggle with schizophrenia. He won the Nobel Prize in Economic Sciences in 1994. 
 
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 The letter, which is dated Feb. 11, 1948 was written by well-known mathematician Richard J. Duffin, who kept it short and to the point: 
 
 Princeton published the letter online Thursday. 
 
 John and his wife Alicia Nash died in a car accident in New Jersey late last month. ||||| Mathematician Richard J. Duffin kept his letter recommending John Nash for graduate school at Princeton University brief. 
 
 But the Feb. 11, 1948 letter includes a powerful line in support of Nash: "He is a mathematical genius." 
 
 Nash was accepted. 
 
 The man whose life was the subject of the movie "A Beautiful Mind" went on to win the Nobel Prize for economics in 1994. Nash was recently awarded the Abel Prize for mathematics. 
 
 Nash, and his wife, Alicia Nash, died last month in a crash on the New Jersey Turnpike after returning from Norway to receive the top mathematics award. 
 
 Princeton University posted the letter from Duffin, as well as other documents from Nash's academic record, online last week. 
 
 Erin O'Neill may be reached at eoneill@njadvancemedia.com. Follow her on Twitter @LedgerErin. Find NJ.com on Facebook. ||||| TRENTON, N.J. (AP) — John Forbes Nash Jr., a mathematical genius whose struggle with schizophrenia was chronicled in the 2001 movie "A Beautiful Mind," has died along with his wife in a car crash on the New Jersey Turnpike. He was 86. 
 
 FILE - In this Oct. 28, 1997 file photo, John Forbes Nash, 1994 Economics Nobel Prize winner, takes a break during the European School of Economics conference in Rome. Nash, the Nobel Prize-winning mathematician... (Associated Press) 
 
 FILE - In this Oct. 11, 1994 file photo, Princeton University professor John Nash speaks during a news conference at the school in Princeton, N.J., after being named the winner of the Nobel Peace Prize... (Associated Press) 
 
 FILE - In this March 24, 2002 file photo, John Nash, left, and his wife Alicia, arrive at the 74th annual Academy Awards, in Los Angeles. Nash, the Nobel Prize-winning mathematician whose struggle with... (Associated Press) 
 
 Nash and Alicia Nash, 82, of Princeton Township, were killed in a taxi crash Saturday, state police said. A colleague who had received an award with Nash in Norway earlier in the week said they had just flown home and the couple had taken a cab home from the airport. 
 
 Russell Crowe, who portrayed Nash in "A Beautiful Mind," tweeted that he was "stunned." 
 
 "An amazing partnership," he wrote. "Beautiful minds, beautiful hearts." 
 
 Known as brilliant and eccentric, Nash was associated with Princeton University for many years, most recently serving as a senior research mathematician. He won the Nobel Prize in economics in 1994 for his work in game theory, which offered insight into the dynamics of human rivalry. It is considered one of the most influential ideas of the 20th century. 
 
 Just a few days ago, Nash had received a prize from the Norwegian Academy of Sciences and Letters in Oslo with New York University mathematician Louis Nirenberg, who said he'd chatted with the couple for an hour at the airport in Newark before they'd gotten a cab. Nirenberg said Nash was a truly great mathematician and "a kind of genius." 
 
 "We were all so happy together," Nirenberg said. "It seemed like a dream." 
 
 John David Stier, Nash's son with his first wife, said he learned of the death Sunday morning. "It's very upsetting," he said. 
 
 In an autobiography written for The Nobel Foundation Web site, Nash said delusions caused him to resign as a faculty member at M.I.T. He also spent several months in New Jersey hospitals on an involuntary basis. 
 
 However, Nash's schizophrenia diminished through the 1970s and 1980s as he "gradually began to intellectually reject some of the delusionally influenced lines of thinking," he wrote. 
 
 The 2001 film "A Beautiful Mind" won four Oscars, including best picture and best director, and generated interest in John Nash's life story. The movie was based on an unauthorized biography by Sylvia Nasar, who wrote that Nash's contemporaries found him "immensely strange" and "slightly cold, a bit superior, somewhat secretive." 
 
 Much of his demeanor likely stemmed from mental illness, which began emerging in 1959 when Alicia was pregnant with a son. The film, though, did not mention Nash older son or to the years that he and Alicia spent living together after divorcing. The couple split in 1963, then resumed living together several years later and finally remarried in 2001. 
 
 Born in Bluefield, W. Va., to an electrical engineer and a housewife, Nash had read the classic "Men of Mathematics" by E.T. Bell by the time he was in high school. He planned to follow in his father's footsteps and studied for three years at the Carnegie Institute of Technology in Pittsburgh (now Carnegie Mellon University), but instead developed a passion for mathematics. 
 
 He then went to Princeton, where he worked on his equilibrium theory and, in 1950, received his doctorate with a dissertation on non-cooperative games. The thesis contained the definition and properties of what would later be called the Nash equilibrium. 
 
 Nash then taught at the Massachusetts Institute of Technology for several years and held a research post at Brandeis University before eventually returning to Princeton. 
 
 A Princeton spokesman did not immediately comment.
– Like a strong, simple letter of recommendation? Well it helps if the subject is a genius. Mathematician Richard Duffin wrote a letter to Princeton University for John Forbes Nash, Jr., who became an esteemed mathematician and the subject of the film A Beautiful Mind, Mashable reports. Dated Feb. 11, 1948, the letter reads: "This is to recommend John F. Nash, Jr. who has applied for entrance to the graduate college at Princeton. Mr. Nash is 19 years old and is graduating from Carnegie Tech in June. He is a mathematical genius. Yours Sincerely, Richard J. Duffin." The letter was successful, notes Vox, and Nash went on to win the Nobel Prize for Economics in 1994, the Star-Ledger reports. Nash and his wife died in a taxi crash last month, but weren't supposed to be in that taxi.