Catherine is a woman in her late twenties who is strongly devoted to her father, Robert, a brilliant and well-known mathematician whose grip on reality is beginning to slip away. As Robert descends into madness, Catherine begins to wonder if she may have inherited her father’s mental illness along with his mathematical genius. When Robert’s work reveals a mathematical proof of potentially historic proportions, it sets off shock waves in more ways than one.

Featured Clips

• 03:10

  Proof - Sunday Morning

  The morning after the party, Catherine gives Hal a surprising gift. In this scene: Catherine (Gwyneth Paltrow), Hal (Jake Gyllenhaal)
• 02:47

  Proof - Sisters

  Catherine's slightly obsessive-compulsive sister Claire stops by for an awkward (and overbearing) visit. In this scene: Catherine (Gwyneth Paltrow), Claire (Hope Davis)
• 01:48

  Proof - Save It

  Catherine reaches her wits' end after spending the day shopping with her sister Claire. In this scene: Claire (Hope Davis), Catherine (Gwyneth Paltrow), Hal (Jake Gyllenhaal)
• 03:07

  Proof - Security

  Catherine's paranoia reaches new levels when Hal, one of her father's favorite students, comes over to the house. In this scene: Hal (Jake Gyllenhaal), Catherine (Gwyneth Paltrow)
• 03:06

  Proof - Eulogy

  At the funeral, Catherine gives an unplanned eulogy. In this scene: Catherine (Gwyneth Paltrow), Claire (Hope Davis), Hal (Jake Gyllenhaal)