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You can watch Proof (2005) for free on Hoopla, or rent on JustWatch TV.

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.

Proof is a film that explores themes of paranoia, mathematics, mathematician. It also touches on proof and dementia and notebook.