That is the general premise of Proof, a 2001 Pulitzer award-winning play by David Auburn. The story is deceptively simple, and people may tell you the story and maybe the ending (no spoilers here, promise). But if you do you get to watch Proof, you'll get into two engrossing and very enjoyable hours, where one scene cuts seamlessly into the next, and the dialogue simply gets you with its punchiness. It's the first time, ever, too that anyone gets to see Lea Salonga doing a "straight" (vs. musical) play.
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