Proof

Catherine, a troubled woman, has spent years caring for her brilliant, unstable father, a renowned mathematician. After his death, she navigates her own emotions, the return of her estranged sister Claire, and the attentions of Hal, a former student of her father's, who hopes to find valuable work in the 103 notebooks her father left behind. Catherine faces her most challenging problem: how much of her father's madness—or genius—will she inherit?

Tony Award® for Best Play, Pulitzer Prize for Drama, Drama Desk Award for Best Play