We have "evidence" that Anthony Hopkins played Gwyneth Paltrow's dad in this film of a Pulitzer prize-winning play
.... Based on the Pulitzer Prize winning play by David Auburn; The biggest risk in 
life is... [DOC] [TLE] Amazon.com: Proof: Gwyneth Paltrow, Anthony Hopkins, Hope ... [PAR] Elegantly adapted from David Auburn's Pulitzer Prize-winning play, Proof works 
on so ... Gwyneth Paltrow previously played her role onstage, and returns here as 
... grips with the death of her father, a brilliant mathematician (Anthony Hopkins) 
who suffered from mental illness.