You can't. Do you hear me? You think you've figured something out? You run over here so pleased with yourself because you changed your mind. Now you're certain. You're so... sloppy. You don't know anything. The book, the math, the dates, the writing, all that stuff you decided with your buddies, it's just evidence. It doesn't finish the job. It doesn't prove anything.

Spending time with math people is a lot of fun. As a result of the play, I've had semi-drunken dinners with mathematicians all over the country. I recommend the experience.

One [of the two ideas for PROOF] was to write about two sisters who are quarreling over the legacy of something left behind by their father. The other was about someone who knew that her parent had had problems of mental illness [and that] she might be going through the same thing.

You can't. Do you hear me? You think you've figured something out? You run over here so pleased with yourself because you changed your mind. Now you're certain. You're so... sloppy. You don't know anything. The book, the math, the dates, the writing, all that stuff you decided with your buddies, it's just evidence. It doesn't finish the job. It doesn't prove anything.