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Kalle's Ninth Proof of Folding was a mathematical proof produced by Kalle. The writing was poetic, so serious scholars did not take the work seriously. The original document was kept in the Imperial Library on the planet Trantor, written in Kalle's native Thraxian. Hari Seldon presented it to Gaal Dornick after she used the proof to solve the Abraxas Conjecture. At first, Gaal refused to take it from the Library, but Hari insisted, knowing that one day the library would be destroyed and stealing the proof was in fact a mercy.

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