"The "seriousness" of a mathematical theorem lies, not in its practical consequences, which are usually negligible, but in the significance of the mathematical ideas which it connects."

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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.

— David Auburn