Question: When was the American mathematician died who was portrayed in the biographical drama "A Beautiful Mind" (2001)?
Context: Edward Allen Harris (born November 28, 1950) is an American actor, producer, director, and screenwriter.  He is known for his performances in films such as "The Right Stuff" (1983), "The Abyss" (1989), "Glengarry Glen Ross" (1992), "Apollo 13" (1995), "Nixon" (1995), "The Rock" (1996), "Absolute Power" (1997), "A Beautiful Mind" (2001), "Enemy at the Gates" (2001), "Radio" (2003), "A History of Violence" (2005), "Gone Baby Gone" (2007), "The Way Back" (2010), "Man on a Ledge" (2012), "Gravity" (2013), "Snowpiercer" (2013), and "Run All Night" (2015).  Harris currently stars in the HBO sci-fi drama series "Westworld". This is a list of American films released in 2001. " A Beautiful Mind" won the Academy Award for Best Picture and the Golden Globe Award for Best Motion Picture – Drama. ""  won the BAFTA Award for Best Film. " Moulin Rouge! " won the Golden Globe Award for Best Motion Picture – Musical or Comedy and the Satellite Award for Best Film – Musical or Comedy. " In the Bedroom" won the Satellite Award for Best Film – Drama. John Forbes Nash Jr. (June 13, 1928 – May 23, 2015) was an American mathematician who made fundamental contributions to game theory, differential geometry, and the study of partial differential equations. Nash's work has provided insight into the factors that govern chance and decision-making inside complex systems found in everyday life. Arthur Harold Stone (30 September 1916 – 6 August 2000) was a British mathematician born in London, who worked mostly in topology.  His wife was American mathematician Dorothy Maharam.  His first paper dealt with squaring the square, he proved the Erdős–Stone theorem with Paul Erdős and is credited with the discovery of the first flexagon, a trihexaflexagon while he was a student at Princeton University in the USA in 1939.  The Stone's metrization theorem has been named after him, and he was a member of a group of mathematicians who published pseudonymously as Blanche Descartes.  He is not to be confused with American mathematician Marshall Harvey Stone. A Beautiful Mind (1998) is a biography of Nobel Prize-winning economist and mathematician John Forbes Nash, Jr. by Sylvia Nasar, professor of journalism at Columbia University.  An unauthorized work, it won the National Book Critics Circle Award in 1998 and was nominated for the Pulitzer Prize in biography.  It inspired the 2001 film by the same name. This is the complete filmography of Russell Crowe throughout his entire career.  Crowe has acted in blockbuster films such as "Gladiator" (2000), a historical epic for which he won the Academy Award for Best Actor.  He is also a winner of the BAFTA Award for Best Actor in a Leading Role and Golden Globe Award for Best Actor – Motion Picture Drama for his portrayal of John Forbes Nash Jr. in the biographical drama "A Beautiful Mind" (2001). Uche is a Nigerian name originating among the Igbo people, which can mean "intention", "will", "mind", or "sense".  Variants can include Uchechukwu (which means "God's will" or "God's intention"), Ucheoma (which means "beautiful mind"), and Uchendu (which means "thinking/thought of life").  The name Uche may refer to: Paul Bettany (born 27 May 1971) is an English actor.  He is known for his voice role as J.A.R.V.I.S. and the Vision in the Marvel Cinematic Universe, specifically the films "Iron Man" (2008), "Iron Man 2" (2010), "The Avengers" (2012), "Iron Man 3" (2013), "" (2015) and "" (2016), for which he garnered praise.  He first came to the attention of mainstream audiences when he appeared in the British film "Gangster No. 1" (2000), and director Brian Helgeland's film "A Knight's Tale" (2001).  He has gone on to appear in a wide variety of films, including "A Beautiful Mind" (2001), "" (2003), "Dogville" (2003), "Wimbledon" (2004), and the adaptation of the novel "The Da Vinci Code" (2006). A Beautiful Mind is a 2001 American biographical drama film based on the life of John Nash, a Nobel Laureate in Economics.  The film was directed by Ron Howard, from a screenplay written by Akiva Goldsman.  It was inspired by a bestselling, Pulitzer Prize-nominated 1998 book of the same name by Sylvia Nasar.  The film stars Russell Crowe, along with Ed Harris, Jennifer Connelly, Paul Bettany, Adam Goldberg, Judd Hirsch, Josh Lucas, Anthony Rapp, and Christopher Plummer in supporting roles.  The story begins in Nash's days as a graduate student at Princeton University.  Early in the film, Nash begins to develop paranoid schizophrenia and endures delusional episodes while painfully watching the loss and burden his condition brings on wife Alicia and friends. A Beautiful Mind is the original soundtrack album, on the Decca Records label, of the 2001 film "A Beautiful Mind" starring Russell Crowe, Jennifer Connelly (who won the Academy Award for Best Supporting Actress for her role as "Alicia Nash"), Christopher Plummer and Paul Bettany.  The original score and songs were composed and conducted by James Horner.
Answer: May 23, 2015