天賦異稟且極具聲望的數學家羅伯特，晚年精神狀態幾近瘋狂。小女兒凱薩琳犧牲求學，全心照顧父親的同時，其意志與精神卻也隨之消沉、混亂。羅伯特死後，學生哈爾出現，與凱薩琳墜入情網，但一本數學論證筆記，讓凱薩琳備受質疑。面對情人間的鴻溝與姐妹間的衝突，她如何找到解答？
聚焦賞析：2001年普立玆獎及東尼獎最佳劇作獎《Proof》，為美國當代劇作家大衛奧本David Auburn之作，在好萊塢電影版上映前，即已有法文、西班牙文、韓文、中文等語言演出。
　
Robert, a mathematician with extraordinary gifts and highly-praised reputation, almost goes mad in his later life. His daughter Katherine gives up studies and decides to take care of her father. While looking after him, she becomes depressed and confused. After Roberts passes away, his student Hal appears and then falls in love with Catherine. However, there is a mathematic notebook. Because of it, Catherine is doubted and questioned by others. In facing the gap with her lover and the conflict with her sister, how does she find a solution?
Focus：American playwright David Auburn’s work, Proof, got the Pulitzer Prize and the first prize in the Tony Award in 2001. Before it was adopted for a Hollywood Movie, it had been performed in various languages such as French, Spanish, Korean, Chinese, etc.