The Miramax film, based on David Auburn's Tony Award and Pulitzer Prize-winning play of the same name, features a screenplay by Auburn and Rebecca Miller. Oscar winner Paltrow heads the cast as Catherine, a woman who may or may not be as mathematically gifted as her troubled genius of a father. The other central characters are played on screen by Jake Gyllenhaal (Hal), Anthony Hopkins (Robert) and Hope Davis (Claire).

John Madden directed the film, which was originally scheduled for a December 2004 release. Madden also directed Paltrow in the London engagement of the play at the Donmar Warehouse.

"Proof," according to Miramax production notes, "is the compelling story of an enigmatic young woman haunted by her father's past and the shadow of her own future, exploring the links between genius and madness, the tender relationships between fathers and daughters and the nature of truth and family. On the eve of her twenty-seventh birthday, Catherine (Paltrow), a young woman who has spent years caring for her brilliant but unstable father, a mathematical genius named Robert (Hopkins), must deal not only with the arrival of her estranged sister, Claire (Davis), but also with the attentions of Hal (Gyllenhaal), a former student of her father's who hopes to find valuable work in the 103 notebooks of Robert's."

The "Proof" film also features Gary Houston, Anne Wittman, Leland Burnett, Daniel Hatkoff, John Keefe, Haroula Spyropoulos, Colin Stinton and Leigh Zimmerman.

Proof opened at Broadway's Walter Kerr Theatre on Oct. 24, 2000, playing 916 performances before closing Jan. 5, 2003. The original cast included Mary-Louise Parker, who won a Tony Award for her performance; Larry Bryggman; Johanna Day; and Ben Shenkman. Under the direction of Daniel Sullivan, the production also won the 2001 Tony Award for Best Play as well as the Pulitzer Prize in Drama. For more information about the film, visit www.miramax.com/proof.