Few of the characters in the film, besides John and Alicia Nash, correspond directly to actual people. The discussion of the Nash equilibrium was criticized as over-simplified. In the film, Nash suffers schizophrenic hallucinations while he is in graduate school, but in his life he did not have this experience until some years later. No mention is made of Nash's homosexual experiences at RAND, which are noted in the biography, though both Nash and his wife deny this occurred. Nash fathered a son, John David Stier (born June 19, 1953), by Eleanor Agnes Stier (1921–2005), a nurse whom he abandoned when she told him of her pregnancy. The film did not include Alicia's divorce of John in 1963. It was not until after Nash won the Nobel Memorial Prize in 1994 that they renewed their relationship. Beginning in 1970, Alicia allowed him to live with her as a boarder. They remarried in 2001.