| 21. | The digital root is an interesting property of a natural number.
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| 22. | The second part of the program nondeterministically chooses a natural number on request.
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| 23. | Formally, a decision problem is a subset of the natural numbers.
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| 24. | For another example, consider again the relation | on natural numbers.
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| 25. | Thus Dedekind infinite sets contain subsets that correspond bijectively with the natural numbers.
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| 26. | These registers hold only natural numbers ( zero and the positive integers ).
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| 27. | However, it also blocks one standard definition of the natural numbers.
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| 28. | Note that the natural numbers are isomorphic to lists of units.
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| 29. | The sum of any natural numbers shall give the number 2008.
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| 30. | But this is impossible, since natural numbers cannot be shrunk indefinitely.
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