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It is not at all easy to draw a sharp line between cases where what is happening could be called "addition", and where some other word is wanted. If you think about the question, you will probably come up with some criterion involving separation of the objects in space, and making sure each one is clearly distinguishable from all the others. But then how could one count ideas? Or the number of gases comprising the atmosphere?
— Gödel, Escher, Bach: An Eternal Golden Braid
(book)
by Douglas Hofstadter
(see stats)
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