Proof
David Auburn

Catherine has spent years caring for her brilliant but unstable father, a renowned mathematician. Now, following his death, she must deal with her own volatile emotions, compounded by the arrival of her estranged sister, Claire, and the attention of Hal, her father’s former student who hopes to find valuable work in the 103 notebooks left behind. Over a long weekend, a burgeoning romance and the discovery of a cryptic notebook draw Catherine into the most difficult problem of all: How much of her father’s madness, or genius will she inherit?

David Auburn’s Proof won both the Pulitzer Prize for Drama and the 2001 Tony Award for Best Play.