The Back Porch - The setting where all of the action and dialogue takes place.
The Proof - Catherine's mathematical theorem, formerly believed unprovable, though no one believes she wrote it.
Robert's Notebooks - One hundred and thirty objects left behind by the mathematical genius turned madman.
Northwestern - The university Catherine attended until she had to drop out to care for her father.
Hal's Thesis - The reason Hal seeks Robert's guidance, occasioning his first meeting with Catherine.
Hal's Backpack - The article Catherine searches when she is initially suspicious of Hal's motives.
Hal's Jacket - What Hal used to conceal the object he attempted to smuggle out of Catherine's house.
i - One of the songs which Hal and his bandmates play. The title is the mathematical term for imaginary number.
Catherine's Key - The object Catherine wears on a chain around her neck. It goes to the...
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