Proof Positive Sure signs of autumn: The leaves are changing. There's a nip in the air. John Lee Beatty is designing Broadway shows. This year, the set designer kicks off the season with a pair of plays, one from a neophyte and one from the last of the Broadway masters.
First, there's Proof, which opened last May at Manhattan Theatre Club to general acclaim; it transferred to Broadway's Walter Kerr Theatre on October 24. David Auburn's tightly plotted drama centers around Catherine, a