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The Cat in Numberland by John O'Brien, Ivar Ekeland

paulogonzalez's review against another edition

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4.0

That's a book for kids that explains some very difficult concepts concerning infinity. To explain Georg Cantor's words about infinity, David Hilbert had the idea of this hotel with infinitely many rooms, and here Ekelund explores it finely in the form of a children's tale.
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