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.

Gwyneth Paltrow
as Catherine Llewellyn

Anthony Hopkins
as Robert Llewellyn

Jake Gyllenhaal
as Harold 'Hal' Dobbs

Hope Davis
as Claire Llewellyn

Danny McCarthy
as Cop

Tobiasz Daszkiewicz
as Limo Driver

Gary Houston
as Professor Barrow

Leigh Zimmerman
as Friend at Party

Colin Stinton
as Theoretical Physicist

Leland Burnett
as Band Vocalist
tmdb28039023
Math is an exact science. A mathematical proof is a demonstration of this exactness. Math can also be, according to those who study it, beautiful – an art form even; in that sense, Proof is an aptly titled film in which mathematics overlaps with metaphysics, poetry and even faith. Proof knows its...
CinemaSerf
This film quite succinctly sums up the characteristics of it's principal character. At times it's potent and at others it's a mess. It's all about "Catherine" (Gwyneth Paltrow) who together with her sister "Claire" (Hope Davis) are the daughters of acclaimed mathematician "Robert" (Sir Anthony Hopki...