Watch Proof (2005) HD Full Movie Free on SolarMovie. Watch Proof (2005) online free. The daughter of a brilliant but mentally disturbed mathematician, recently deceased, tries to come t...The daughter of a brilliant but mentally disturbed mathematician, recently deceased, tries to come to grips with her possible inheritance: his insanity. Complicating matters are one of her father's ex-students, who wants to search through his papers, and her estranged sister, who shows up to help settle his affairs.