Proof, by David Auburn, is a Pulitzer and Tony Award-winning play about Catherine, the daughter of a brilliant but mentally ill mathematician, who grapples with her own potential for genius and instability after her father's death. The plot centers on the discovery of a groundbreaking mathematical proof in her father's notebooks, leading to a debate over its authorship and forcing Catherine to confront her family's legacy, her relationship with her sister Claire, and a budding romance with her father's former student, Hal. The play explores themes of love, loss, genius, and the elusive nature of truth, questioning whether the proof is Catherine's or her father's.